1. Abbreviations

2. Changes by time period
    Late Proto-Germanic period  Northwest Germanic period  West Germanic period  Ingvaeonic and Anglo-Frisian period  Old English period  Until Middle English  Up to Shakespeare's English  Up to the American–British split  After American–British split, up to World War II  After World War II 

3. Examples of sound changes

4. Summary of vowel developments
    Development of Middle English vowels  Monophthongs  Diphthongs  Development of Old English vowels 

5. See also

6. Notes

7. References

The phonological history of English describes the changing phonology of the English language over time, starting from its roots in proto-Germanic to diverse changes in different dialects of modern English.

Abbreviations

In the following description, abbreviations are used as follows:

• C = any consonant
• V = any vowel
• # = end of word
• = reconstructed
• = non-existent
• > = changes into
• >! = changes into, unexpectedly
• < = is derived from

• PreOE = Pre-Old English
• OE = Old English
• EME = Early Middle English
• LME = Late Middle English
• ME = Middle English
• EModE = Early Modern English
• ModE = Modern English
• GA = General American
• RP = Received Pronunciation

• PrePG = Pre-Proto-Germanic
• PG = Proto-Germanic
• NWG = Northwest Germanic
• WG = West Germanic
• OHG = Old High German
• MHG = Middle High German
• ModG = Modern German

• PIE = Proto-Indo-European
• Goth = Gothic
• PN = Proto-Norse
• ON = Old Norse
• OEN = Old East Norse
• OWN = Old West Norse
• OS = Old Saxon

Changes by time period

This section summarizes the changes occurring within distinct time periods, covering the last 2,000 years or so. Within each subsection, changes are in approximate chronological order.

The time periods for some of the early stages are quite short due to the extensive population movements occurring during the Migration Period (early AD), which resulted in rapid dialect fragmentation.

Late Proto-Germanic period

This period includes changes in late Proto-Germanic, up to about the 1st century. Only a general overview of the more important changes is given here; for a full list, see the Proto-Germanic article.

• Unstressed word-final {{IPA|/a/}} and {{IPA|/e/}} were lost. Early PG {{lang|gem-x-proto|barta}} > late PG {{lang|gem-x-proto|bart}} "you carried (sg)".
• /n">Word-final {{IPA|/m/}} became {{IPA|/n/}}.
  • Word-final {{IPA|/n/}} was then lost after unstressed syllables with nasalization of the preceding vowel. Hence PrePG {{PIE|dʰogʰom}} > early PG {{lang|gem-x-proto|dagam}} > late PG {{lang|gem-x-proto|dagą}} > OE {{lang|ang|dæġ}} "day (acc. sg.)". The nasalisation was retained at least into the earliest history of Old English.
• Word-final {{IPA|/t/}} was lost after an unstressed syllable. This followed the loss of word-final {{IPA|/n/}}, because it remained before {{IPA|/t/}}: PrePG {{PIE|bʰr̥n̥t}} > early PG {{lang|gem-x-proto|burunt}} > late PG {{lang|gem-x-proto|burun}} "they carried".
• /i">{{IPA|/e/}} was raised to {{IPA|/i/}} in unstressed syllables.
  • The original vowel remained when followed by {{IPA|/r/}}, and was later lowered to {{IPA|/ɑ/}}.
• Early i-mutation: {{IPA|/e/}} was raised to {{IPA|/i/}} when an {{IPA|/i/}} or {{IPA|/j/}} followed in the next syllable.
  • This occurred before deletion of word-final {{IPA|/i/}}; hence PIE {{PIE|upéri}} > early PG {{lang|gem-x-proto|uberi}} > late PG {{lang|gem-x-proto|ubiri}} > German {{lang|de|über}} "over". Compare PIE {{PIE|upér}} > early PG {{lang|gem-x-proto|uber}} > late PG {{lang|gem-x-proto|ubar}} > German {{lang|de|ober}} "over".
  • But it occurred after the raising of unstressed {{IPA|/e/}} to {{IPA|/i/}}: PIE {{PIE|bʰérete}} > PG {{lang|gem-x-proto|berid}} > {{lang|gem-x-proto|birid}} "you carry (pl)".
  • This also affected the diphthong {{IPA|/eu/}}, which became {{IPA|/iu/}}.
  • As a consequence of this change, {{IPA|/ei/}} > {{IPA|/iː/}}. The Elder Futhark of the Proto-Norse language still contained different symbols for the two sounds.
• z-umlaut: {{IPA|/e/}} is raised to {{IPA|/i/}} before {{IPA|/z/}}.
  • Early PG {{lang|gem-x-proto|mez}} "me, dative" > late PG {{lang|gem-x-proto|miz}} > OHG mir, OS mi, ON mér (with general lowering and lengthening of i before r).
  • This change was only sporadic at best because there were barely any words in which it could have occurred at all, since {{IPA|/e/}} remained only in stressed syllables. The umlauting effect of {{IPA|/z/}} remained, however, and in Old West Norse it was extended to other vowels as well. Hence OEN glaʀ, hrauʀ, OWN gler, hreyrr.
• Pre-nasal raising: {{IPA|/e/}} > {{IPA|/i/}} before nasal + consonant. PrePG {{PIE|bʰendʰonom}} > PG {{lang|gem-x-proto|bendaną}} > {{lang|gem-x-proto|bindaną}} > OE bindan > ModE bind (Latin {{lang|la|of-fendō}}).
  • This was later extended in Pre-Old English times to vowels before all nasals; hence OE niman "take" but OHG neman.
• Loss of {{IPA|/n/}} before {{IPA|/x/}}, with nasalization and compensatory lengthening of the preceding vowel.
  • The nasalization was eventually lost, but remained through the Ingvaeonic period.
  • Hence PrePG {{PIE|tongjonom}} > PG {{lang|gem-x-proto|þankijaną}} > OE þencan > ModE think, but PrePG {{PIE|tonktos}} > PG {{lang|gem-x-proto|þanhtaz}} > {{lang|gem-x-proto|þą̄htaz}} > OE {{lang|ang|þōht}} > ModE thought.
  • This change followed the raising of {{IPA|/e/}} before a nasal: PG {{lang|gem-x-proto|þenhaną}} > {{lang|gem-x-proto|þinhaną}} > {{lang|gem-x-proto|þį̄haną}} > Gothic {{lang|got|þeihan}}.
• Final-syllable short vowels were generally deleted in words of three syllables or more. PG {{lang|gem-x-proto|biridi}} > Goth {{lang|got|baíriþ}} {{IPA|/beriθ/}} "(he) carries" (see above), and also PG {{lang|gem-x-proto|-maz}}, {{lang|gem-x-proto|-miz}} > {{lang|gem-x-proto|-mz}} (dative and instrumental plural ending of nouns, 1st person plural ending of verbs, as on the Stentoften Runestone).

Northwest Germanic period

This was the period that existed after the East Germanic languages had split off. Changes during this time were shared with the North Germanic dialects, i.e. Proto-Norse. Many of the changes that occurred were areal, and took time to propagate throughout a dialect continuum that was already diversifying. Thus, the ordering of the changes is sometimes ambiguous, and can differ between dialects.

• Allophonic i-mutation/Germanic umlaut: Short back vowels were fronted when followed in the next syllable by {{IPA|/i/}} or {{IPA|/j/}}, by i-mutation: {{IPA|/ɑ/}} > {{IPA|[æ]}}, {{IPA|/o/}} > {{IPA|[ø]}}, {{IPA|/u/}} > {{IPA|[y]}}
  • In this initial stage, the mutated vowels were still allophonically conditioned, and were not yet distinct as phonemes. Only later, when the {{IPA|/i/}} and {{IPA|/j/}} were modified or lost, were the new sounds phonemicized.
  • i-mutation affected all the Germanic languages except for Gothic, although with a great deal of variation. It appears to have occurred earliest, and to be most pronounced, in the Schleswig-Holstein area (the home of the Anglo-Saxons), and from there to have spread north and south. However, it is possible that this change already occurred in Proto-Germanic proper, in which case the phenomenon would have remained merely allophonic for quite some time. If that is the case, that would be the stage reflected in Gothic, where there is no orthographic evidence of i-mutation at all.
  • Long vowels and diphthongs were affected only later, probably analogically, and not in all areas. Notably, they were not mutated in most (western) Dutch dialects, whereas short vowels were.
• a-mutation: {{IPA|/u/}} is lowered to {{IPA|/o/}} when a non-high vowel follows in the next syllable.
  • This is blocked when followed by a nasal followed by a consonant, or by a cluster with {{IPA|/j/}} in it. Hence PG {{lang|gem-x-proto|gulþą}} > OE/ModE gold, but PG {{lang|gem-x-proto|guldijaną}} > OE gyldan > ModE gild.
  • This produces a new phoneme {{IPA|/o/}}, due to inconsistent application and later loss of word-final vowels.
• Final-syllable long vowels were shortened.
  • Final {{IPA|/ɔː/}} becomes {{IPA|/o/}}, later raised to {{IPA|/u/}}. PG {{lang|gem-x-proto|sagō}} ("saw (tool)") > OE sagu, ON sǫg.
  • Final {{IPA|/ɛː/}} becomes {{IPA|/e/}} in ON (later raised to {{IPA|/i/}}), {{IPA|/ɑ/}} in West Germanic. PG {{lang|gem-x-proto|hailidē}} ("he/she/it healed") > ON heilði, but OE hǣlde, OHG heilta.
  • The final long diphthong {{IPA|/ɔːi/}} loses its final element and usually develops the same as {{IPA|/ɔː/}} from that point on. PG {{lang|gem-x-proto|gebōi}} ("gift", dative singular) > NWG {{lang|gem-x-proto|gebō}} > ON gjǫf, OHG gebu, OE giefe (an apparent irregular development).
• "Overlong" vowels were shortened to regular long vowels.
• PG {{IPA|/ɛː/}} (maybe already {{IPA|/æː/}} by late PG) becomes {{IPA|/ɑː/}}. This preceded final shortening in West Germanic, but postdated it in North Germanic.
• Unstressed diphthongs were monophthongized. {{IPA|/ɑi/}} > {{IPA|/eː/}}, {{IPA|/ɑu/}} > {{IPA|/oː/}}. The latter merged with ō from shortened overlong ô. PG {{lang|gem-x-proto|sunauz}} ("son", genitive singular) > NWG {{lang|gem-x-proto|sunōz}} > ON sonar, OE suna, OHG suno; PG {{lang|gem-x-proto|nemai}} ("he/she/it take", subjunctive) > NWG {{lang|gem-x-proto|nemē}} > ON nemi, OE nime, OHG neme; PG {{lang|gem-x-proto|stainai}} ("stone", dative singular) > NWG {{lang|gem-x-proto|stainē}} > ON steini, OE {{lang|ang|stāne}}, OHG steine.

West Germanic period

This period occurred around the 2nd to 4th centuries. It is unclear if there was ever a distinct "Proto-West Germanic", as most changes in this period were areal, and likely spread throughout a dialect continuum that was already diversifying further. Thus, this "period" may not have been a real timespan, but may simply cover certain areal changes that did not reach into North Germanic. This period ends with the further diversification of West Germanic into several groups before and during the Migration Period: Ingvaeonic, Istvaeonic (Old Frankish) and Irminonic (Upper German).

• Loss of word-final {{IPA|/z/}}.
  • This change occurred before rhotacization, as original word-final {{IPA|/r/}} was not lost.
  • But it must have occurred after the Northwest Germanic split, since word-final {{IPA|/z/}} was not eliminated in Old Norse, instead merging with {{IPA|/r/}}.
  • {{IPA|/z/}} was not lost in single-syllable words in southern and central German. Compare PG {{lang|gem-x-proto|miz}} > OS mi, OE me vs. OHG mir.
  • The OE nominative plural {{lang|ang|-as}} (ME {{lang|enm|-s}}), OS nominative plural {{lang|osx|-ōs}} may be from original accusative plural {{lang|gem-x-proto|-ans}}, due to the Ingvaeonic Nasal-Spirant law, rather than original nominative plural {{lang|gem-x-proto|-ōz}}, which would be expected to become -a (OHG -a, compare ON {{lang|non|-ar}}).
• Rhotacization: {{IPA|/z/}} > {{IPA|/r/}}.
  • This change also affected Proto-Norse, but only much later. {{IPA|/z/}} and {{IPA|/r/}} were still distinct in the Danish and Swedish dialect of Old Norse, as is testified by distinct runes. ({{IPA|/z/}} is normally assumed to be a rhotic fricative in this language, but there is no actual evidence of this.)
  • PG {{PIE|deuzą}} > Goth {{lang|got|dius}}; OE dēor > ModE deer
• West Germanic gemination: single consonants followed by {{IPA|/j/}} except {{IPA|/r/}} became double (geminate). This only affected consonants preceded by a short vowel, because those preceded by a long vowel or by another consonant were never followed by {{IPA|/j/}} due to Sievers' law.
  • PG {{PIE|bidjaną, habjaną}} > OE biddan, habban > ModE bid, have

Ingvaeonic and Anglo-Frisian period

This period is estimated to have lasted only a century or so, the 4th to 5th; the time during which the Franks started to spread south into Gaul (France) and the various coastal people began colonising Britain. Changes in this period affected the Ingvaeonic languages, but not the more southerly Central and Upper German languages. The Ingvaeonic group was probably never homogeneous, but was divided further into Old Saxon and Anglo-Frisian. Old Frankish (and later Old Dutch) was not in the core group, but was affected by the spread of several areal changes from the Ingvaeonic area.

The Anglo-Frisian languages shared several unique changes that were not found in the other West Germanic languages. The migration to Britain caused a further split into early Old English and early Old Frisian.

• Ingvaeonic nasal spirant law: Loss of nasals before fricatives, with nasalization and compensatory lengthening of the preceding vowel. Hence PG {{lang|gem-x-proto|munþaz}} became ModG Mund but in Ingvaeonic dialects first became {{lang|gem-x-proto|mų̄þa}}. Old English then denasalised the vowels, giving OE {{lang|ang|mūþ}} > ModE "mouth".
  • Following this {{IPA|/ɑ̃ː/}} > {{IPA|/õː/}}. PrePG {{PIE|donts}} > PG {{lang|gem-x-proto|tanþs}} > {{lang|gem-x-proto|tą̄þ}} > {{lang|gem-x-proto|tǭþ}} > OE {{lang|ang|tōþ}} > ModE "tooth". (ModG Zahn < OHG zant.) This also applied to {{IPA|/ɑ̃ː/}} arising earlier in Proto-Germanic: PG {{lang|gem-x-proto|þanhtǭ}} > Late PG {{lang|gem-x-proto|þą̄htǭ}} > OE {{lang|ang|þōhte}} > ModE "(I) thought".
• Anglo-Frisian brightening:
  • Fronting of {{IPA|/ɑ/}} to {{IPA|/æ/}}{{sfn|Campbell|1959|pp=52–53|sec=131–133}} (unless followed by a geminate, by a back vowel in the next syllable,{{sfn|Campbell|1959|pp=60–62|sec=157–163}} or in certain other cases). Hence OE dæġ {{IPA|/dæj/}} "day", plural dagas {{IPA|/dɑɣɑs/}} "days" (dialectal ModE "dawes"; compare ModE "dawn" < OE dagung {{IPA|/dɑɣuŋɡ/}}).
  • This does not affect nasal {{IPA|/ɑ̃/}}. And since this is a back vowel, {{IPA|/ɑ/}} in a preceding syllable was prevented from being fronted as well. This created an alternation between the infinitive in -aną and strong past participle in -ana (< PG anaz), where the former became -an in OE but the latter became -ænæ > -en.
  • Fronting of {{IPA|/ɑː/}} to {{IPA|/æː/}} (generally, unless {{IPA|/w/}} followed).{{sfn|Campbell|1959|pp=50–51|sec=127–129}}
• Final-syllable {{IPA|/æ/}}, {{IPA|/ɑ/}} and {{IPA|/ɑ̃/}} are lost.
  • No attested West Germanic languages show any reflexes of these vowels. However, the way it affected the fronting of {{IPA|/ɑ/}} as described above shows that at least {{IPA|/ɑ̃/}} was retained into the separate history of Anglo-Frisian.

Old English period

This period is estimated to be c. AD 475–900. This includes changes from the split between Old English and Old Frisian (c. AD 475) up through historic early West Saxon of AD 900:

• Breaking of front vowels.{{sfn|Campbell|1959|pp=54–60|sec=139–156}}
  • Most generally, before {{IPA|/x, w/}}, and {{IPA|/r, l/}} + consonant (assumed to be velarized {{IPA|[rˠ, ɫ]}} in these circumstances), but exact conditioning factors vary from vowel to vowel.
  • Initial result was a falling diphthong ending in {{IPA|/u/}}, but this was followed by diphthong height harmonization, producing short {{IPA|/æ̆ɑ̆/}}, {{IPA|/ĕŏ/}}, {{IPA|/ĭŭ/}} from short {{IPA|/æ/}}, {{IPA|/e/}}, {{IPA|/i/}}, long {{IPA|/æɑ/}}, {{IPA|/eo/}}, {{IPA|/iu/}} from long {{IPA|/æː/}}, {{IPA|/eː/}}, {{IPA|/iː/}}.
  • Written ea, eo, io, where length is not distinguished graphically.
  • Result in some dialects, for example Anglian, was back vowels rather than diphthongs. West Saxon ceald; but Anglian cald > ModE cold.
• Diphthong height harmonization: The height of one element of each diphthong is adjusted to match that of the other.
  • {{IPA|/ɑi/}} > {{IPA|/ɑː/}} through this change,{{sfn|Campbell|1959|p=53|sec=34}} possibly through an intermediate stage {{IPA|/ɑæ/}}. PG {{lang|gem-x-proto|stainaz}} > OE {{lang|ang|stān}} > ModE stone.
  • {{IPA|/ɑu/}} was first fronted to {{IPA|/æu/}} and then harmonized to {{IPA|/æɑ/}}. PG {{lang|gem-x-proto|draumaz}} > OE {{PIE|drēam}} "joy" (cf. ModE dream, ModG Traum). PG {{lang|gem-x-proto|dauþuz}} > OE {{lang|ang|dēaþ}} > ModE death (Goth {{lang|got|dáuþus}}, ModG Tod). PG {{lang|gem-x-proto|augō}} > OE {{PIE|ēage}} > ModE eye (Goth {{lang|got|áugo}}, ModG Auge).
  • {{IPA|/eu/}} is harmonized to {{IPA|/eo/}}.
• A-restoration: Short {{IPA|/æ/}} is backed to {{IPA|/ɑ/}} when a back vowel follows in the next syllable.{{sfn|Campbell|1959|pp=52–53|sec=131–133}}
  • This produces alternations such as OE dæġ "day", pl. dagas (cf. dialectal dawes "days").
• Palatalization of velar consonants: {{IPA|/k, ɡ, ɣ, sk/}} were palatalized to {{IPA|/tʃ, dʒ, ʝ, ʃ/}} in certain complex circumstances. A similar palatalization happened in Frisian, but by this point the languages had split up; the Old English palatalization must be ordered after Old-English-specific changes such as a-restoration.
  • Generally, the velar stops {{IPA|/k, ɡ/}} were palatalized before {{IPA|/i(ː)/}} or {{IPA|/j/}}; after {{IPA|/i(ː)/}} when not before a vowel; and {{IPA|/k/}} was palatalized at the beginning of a word before front vowels. (At this point, there was no word-initial {{IPA|/ɡ/}}.)
  • {{IPA|/ɣ/}} was palatalized in somewhat broader circumstances: By any following front vowel, as well as by a preceding front vowel when a vowel did not immediately follow the {{IPA|/ɣ/}}.
  • {{IPA|/ʝ/}} later becomes {{IPA|/j/}}, but not before the loss of older {{IPA|/j/}} below.
  • {{IPA|/sk/}} is palatalized in almost all circumstances. PG {{lang|gem-x-proto|skipaz}} > ModE ship (cf. skipper < Dutch schipper, where no such change happened), but West Frisian skip. PG {{lang|gem-x-proto|skurtijaz}} > OE scyrte > ModE shirt, but > ON skyrt > ModE skirt.{{sfn|Cercignani|1983}} An example of retained {{IPA|/sk/}} is PG {{lang|gem-x-proto|aiskōną}} > OE ascian > ModE ask; there is evidence that OE ascian was sometimes rendered metathetized to acsian, which is the presumed origin of ModE ask.
• Palatal diphthongization: Initial palatal {{IPA|/j/}}, {{IPA|/tʃ/}}, {{IPA|/ʃ/}} trigger spelling changes of a > ea, e > ie.{{sfn|Campbell|1959|pp=64–71|sec=170–189}} It is disputed whether this represents an actual sound change{{sfn|Campbell|1959}}{{sfn|Mitchell|Robinson|2001}} or merely a spelling convention{{sfn|Lass|1994}} indicating the palatal nature of the preceding consonant (written g, c, sc were ambiguous in OE as to palatal {{IPA|/j/}}, {{IPA|/tʃ/}}, {{IPA|/ʃ/}} and velar {{IPA|/ɡ/}} or {{IPA|/ɣ/}}, {{IPA|/k/}}, {{IPA|/sk/}}, respectively).
  • Similar changes of o > eo, u > eo are generally recognized to be merely a spelling convention. Hence WG {{IPA|/juŋɡ/}} > OE geong {{IPA|/juŋɡ/}} > ModE "young"; if geong literally indicated an {{IPA|/ɛ̆ɔ̆/}} diphthong, the modern result would be yeng.
  • It is disputed whether there is Middle English evidence of the reality of this change in Old English.
• i-mutation: The most important change in the Old English period. All back vowels were fronted before a {{IPA|/i, j/}} in the next syllable, and front vowels were raised.
  • {{IPA|/ɑ(ː)/}} > {{IPA|/æ(ː)/}} (but {{IPA|/ɑ/}} > {{IPA|/e/}} before {{IPA|/m/}} or {{IPA|/n/}});
  • {{IPA|/o(ː)/}} > {{IPA|/ø(ː)/}} > {{IPA|/e(ː)/}};
  • {{IPA|/u(ː)/}} > {{IPA|/y(ː)/}};
  • {{IPA|/æa/}}, {{IPA|/eo/}} > {{IPA|/iy/}} > {{IPA|/yː/}}; this also applied to the equivalent short diphthongs.
  • Short {{IPA|/e/}} > {{IPA|/i/}} by an earlier pan-Germanic change under the same circumstances; often conflated with this change.
  • This had dramatic effects in inflectional and derivational morphology, e.g. in noun paradigms (fōt "foot", pl. fēt "feet"); verb paradigms (bacan "to bake", bæcþ "he bakes"); nominal derivatives from adjectives (strang "strong", strengþ(u) "strength"), from verbs (cuman "to come", cyme "coming"), and from other nouns (fox "fox", fyxenn "vixen"); verbal derivatives (fōda "food", fēdan "to feed"); comparative adjectives (eald "old", ieldra "older, elder"). Note that many echoes of i-mutation are still present in the modern language.
• Close-vowel loss: Loss of word-final {{IPA|/i/}} and {{IPA|/u/}} (also from earlier {{IPA|/oː/}}) except when following a short syllable (i.e. one with a short vowel followed by a single consonant.) For example, PIE {{PIE|sunus}} > PG {{lang|gem-x-proto|sunuz}} > OE sunu "son (nom. sing.)", PIE {{PIE|peḱu}} > PG {{lang|gem-x-proto|fehu}} > OE feohu "cattle (nom. sing.)", PIE {{PIE|wenis}} > PG {{lang|gem-x-proto|winiz}} > OE ƿine "friend (nom. sing.)", but PrePG {{PIE|pōdes}} > PG {{lang|gem-x-proto|fōtiz}} > WG {{lang|gem-x-proto|fø̄ti}} > OE {{lang|ang|fēt}} "foot (nom. pl.)".
• Loss of {{IPA|/j/}} and {{IPA|/ij/}} following a long syllable.
  • A similar change happened in the other West Germanic languages, although after the earliest records of those languages.
  • This did not affect the new {{IPA|/j/}} (< {{IPA|/ʝ/}}) formed from palatalisation of PG {{IPA|/ɣ/}}, suggesting that it was still a palatal fricative at the time of the change. For example, PG {{lang|gem-x-proto|wrōgijanan}} > early OE {{IPA|wrøːʝijan}} > OE ƿrēġan ({{IPA|/wreːjan/}}).
  • Following this, PG {{IPA|/j/}} occurred only word-initially and after {{IPA|/r/}} (which was the only consonant that was not geminated by {{IPA|/j/}} and hence retained a short syllable).
• H-loss: Proto-Germanic {{IPA|/x/}} is lost between vowels, and between {{IPA|/l, r/}} and a vowel.{{sfn|Campbell|1959|pp=186–187|sec=461–466}} The preceding vowel is lengthened.{{sfn|Campbell|1959|pp=104–105|sec=241–242}}
  • This leads to alternations such as eoh "horse", pl. ēos, and ƿealh "foreigner", pl. ƿēalas.
• Vowel assimilation: Two vowels in hiatus merge into a long vowel.{{sfn|Campbell|1959|pp=98–104|sec=170–189}}
  • Some examples come from h-loss. Others come from loss of {{IPA|/j/}} or {{IPA|/w/}} between vowels, e.g. PG frijōndz > OE frīond > frēond "friend"; PG saiwimiz "sea (dat. pl.)" > sǣƿum > OE sǣm.
• Back mutation: Short e, i and (in Mercian only) a are sometimes broken to short eo, io, and ea when a back vowel follows in the next syllable.{{sfn|Campbell|1959|pp=85–93|sec=205–221}}
  • Hence seofon "seven" < PG sebun, mioluc, meoluc "milk" < PG meluks.
• Palatal umlaut: Short e, eo, io become i (occasionally ie) before hs, ht.
  • Hence riht "right" (cf. German recht), siex "six" (cf. German sechs).
• Vowel reductions in unstressed syllables:
  • {{IPA|/oː/}} became {{IPA|/ɑ/}} in final syllables, but usually appears as o in medial syllables (although a and u both appear).
  • {{IPA|/æ/}} and {{IPA|/i/}} (if not deleted by high-vowel loss) became {{IPA|/e/}} in final syllables.
  • {{IPA|/u/}} normally became {{IPA|/o/}} in a final syllable except when absolutely word-final.{{sfn|Campbell|1959|pp=155–156|sec=373}}
  • In medial syllables, short {{IPA|/æ, a, e/}} are deleted;{{sfn|Campbell|1959|pp=143–144|sec=341–342}} short {{IPA|/i, u/}} are deleted following a long syllable but usually remain following a short syllable (except in some present-tense verb forms), merging to {{IPA|/e/}} in the process; and long vowels are shortened.
• {{IPA|/ø, øː/}} are unrounded to {{IPA|/e, eː/}}, respectively. This occurred within the literary period.
  • Some Old English dialects retained the rounded vowels, however.
• Early pre-cluster shortening: Vowels were shortened when falling immediately before either three consonances or the combination of two consonants and two additional syllables in the word.
  • Thus, OE gāst > ModE ghost, but OE găstliċ > ModE ghastly (ā > ă/_CCC) and OE crīst > ModE Christ, but OE crĭstesmæsse > ModE Christmas (ī > ĭ/_CC$$).
  • Probably occurred in the seventh century as evidenced by eighth century Anglo-Saxon missionaries' translation into Old Low German, "Gospel" as Gotspel, lit. "God news" not expected Guotspel, "Good news" due to gōdspell > gŏdspell.
• {{IPA|/ĭŭ/}} and {{IPA|/iu/}} were lowered to {{IPA|/ĕŏ/}} and {{IPA|/eo/}} between 800 and 900 AD.
• Initial {{IPA|/ɣ/}} became {{IPA|/ɡ/}} in late Old English. This occurred within the literary period, as evidenced by shifting patterns in alliterative verse.

Until Middle English

This period is estimated to be c. 900–1400.

• Homorganic lengthening: Vowels were lengthened before {{IPA|/ld/}}, {{IPA|/mb/}}, {{IPA|/nd/}}, {{IPA|/rd/}}, probably also {{IPA|/ŋɡ/}}, {{IPA|/rl/}}, {{IPA|/rn/}}, when not followed by a third consonant or two consonants and two syllables.
  • This probably occurred around AD 1000.
  • Later on, many of these vowels were shortened again; but evidence from the Ormulum shows that this lengthening was once quite general.
  • Remnants persist in the Modern English pronunciations of words such as child (but not children, since a third consonant follows), field (plus yield, wield, shield), old (but not alderman as it is followed by at least two syllables), climb, find (plus mind, kind, bind, etc.), long and strong (but not length and strength), fiend, found (plus hound, bound, etc.).
• Pre-cluster shortening: Vowels were shortened when followed by two or more consonants, except when lengthened as above.
  • This occurred in two stages, the first stage occurring already in late Old English and affecting only vowels followed by three or more consonants, or two or more consonants when two syllables followed (an early form of trisyllabic laxing).
• Diphthong smoothing: Inherited height-harmonic diphthongs were monophthongized by the loss of the second component, with the length remaining the same.
  • {{IPA|/æ̆ɑ̆/}} and {{IPA|/æɑ/}} initially became {{IPA|/æ/}} and {{IPA|/æː/}}.
  • {{IPA|/ĕŏ/}} and {{IPA|/eo/}} initially became {{IPA|/ø/}} and {{IPA|/øː/}}.
• Middle English stressed vowel changes:
  • {{IPA|/æː/}} (from Old English {{IPA|/æː, æɑ/}}) and {{IPA|/ɑː/}} became {{IPA|/ɛː/}} and {{IPA|/ɔː/}}, respectively.
  • {{IPA|/æ/}} (from Old English {{IPA|/æ, æ̆ɑ̆/}}) and {{IPA|/ɑ/}} merged into {{IPA|/a/}}.
  • New front-rounded {{IPA|/ø/}} and {{IPA|/øː/}} (from Old English {{IPA|/ĕŏ, eo/}}) were unrounded to {{IPA|/e/}} and {{IPA|/eː/}}.
  • {{IPA|/y/}} and {{IPA|/yː/}} were unrounded to {{IPA|/i/}} and {{IPA|/iː/}}.
• {{IPA|/ɣ/}} became {{IPA|/w/}} or {{IPA|/j/}}, depending on surrounding vowels.
• New diphthongs formed from vowels followed by {{IPA|/w/}} or {{IPA|/j/}} (including from former {{IPA|/ɣ/}}).
  • Length distinctions were eliminated in these diphthongs, yielding diphthongs {{IPA|/ai, ɛi, ei, au, ɛu, eu, iu, ɔu, ou/}} plus {{IPA|/ɔi, ui/}} borrowed from French.
  • Middle English breaking: Diphthongs also formed by the insertion of a glide {{IPA|/w/}} or {{IPA|/j/}} (after back and front vowels, respectively) preceding {{IPA|/x/}}.
• Mergers of new diphthongs:
  • Early on, high-mid diphthongs were raised: {{IPA|/ei/}} merged with {{IPA|/iː/}} (hence eye < OE ēġe rhymes with rye < riġe < OE ryġe), {{IPA|/ou/}} merged with {{IPA|/uː/}} and {{IPA|/eu/}} merged with {{IPA|/iu/}} (hence rue < OE hrēoƿan rhymes with hue < OE hīƿ and new < OE nīƿe).
  • In Late Middle English, {{IPA|/ai/}} and {{IPA|/ɛi/}} merge as {{IPA|/ɛi/}}, so that vain and vein are homophones (the vein–vain merger).
• Trisyllabic laxing: Shortening of stressed vowels when two syllables followed.
  • This results in pronunciation variants in Modern English such as divine vs divinity and south vs. southern (OE sūðerne).
• Middle English open syllable lengthening: Vowels were usually lengthened in open syllables (13th century), except when trisyllabic laxing would apply.
• Reduction and loss of unstressed vowels: Remaining unstressed vowels merged into {{IPA|/ə/}}.
  • Starting around 1400 AD, {{IPA|/ə/}} is lost in final syllables.
• Initial clusters {{IPA|/hɾ/}}, {{IPA|/hl/}}, {{IPA|/hn/}} were reduced by loss of {{IPA|/h/}}.
• Voiced fricatives became independent phonemes through borrowing and other sound changes.
• {{IPA|/sw/}} before back vowel becomes {{IPA|/s/}}; {{IPA|/mb/}} becomes {{IPA|/m/}}.
  • Modern English sword, answer, lamb.
  • {{IPA|/w/}} in swore is due to analogy with swear.
• The {{IPA|/t͡s/}} cluster, present in words imported from Norman, is deaffricated, and merges with {{IPA|/s/}} (which had perhaps been apical in medieval times, as in closely-related Dutch and Low German), thus merging sell and cell.
  • But unlike French, {{IPA|/t͡ʃ/}} and {{IPA|/d͡ʒ/}} are fully preserved.

Up to Shakespeare's English

This period is estimated to be c. AD 1400–1600.

• H-loss completed: {{IPA|/x/}} (written gh) lost in most dialects, so that e.g. taught and taut become homophones, likewise bow (meaning "bend") and bough.
• {{IPA|/al/}} and {{IPA|/ɔl/}} when not followed by a vowel undergo mutations:
  • Before {{IPA|/k/}}, a coronal consonant or word-finally, they are diphthongized to {{IPA|/aul/}} and {{IPA|/ɔul/}}. (By later changes, they become {{IPA|/ɔːl/}} and {{IPA|/oul/}}, as in modern salt, tall, bolt, roll.) After this, the combinations {{IPA|/aulk/}} and {{IPA|/ɔulk/}} lose their {{IPA|/l/}} in most accents, affecting words like talk, caulk, and folk. Words acquired after this change (such as talc) were not affected.
  • Before {{IPA|/f, v/}}, the {{IPA|/l/}} becomes silent, so that half and calf are pronounced with {{IPA|/af/}}, and salve and halve are pronounced with {{IPA|/av/}}. {{IPA|/ɔlv/}} is exempt, so that solve keeps its {{IPA|/l/}}. {{IPA|/ɔlf/}} is not wholly exempt, as the traditional pronunciation of golf was {{IPA|[ɡɔf]}}.
  • Before {{IPA|/m/}}, {{IPA|/al, ɔl/}} become {{IPA|/ɑː, oː/}}, as in alms, balm, calm, palm; Holmes.
  • Some words have irregular pronunciations, e.g. from non-standard dialects (salmon) or spelling pronunciations (falcon in American English).
• Great Vowel Shift; all long vowels raised or diphthongized.
  • {{IPA|/aː, ɛː, eː/}} become {{IPA|/ɛː, eː, iː/}}, respectively.
  • {{IPA|/ɔː, oː/}} become {{IPA|/oː, uː/}}, respectively.
  • {{IPA|/iː, uː/}} become {{IPA|/əi, əu/}} or {{IPA|/ei, ou/}},{{citation needed|date=July 2014}} later {{IPA|/ai/}} and {{IPA|/au/}}.
  • New {{IPA|/ɔː/}} developed from old {{IPA|/au/}} (see below).
  • Thus, {{IPA|/ɔː, oː, uː, au/}} effectively rotated in-place.
  • {{IPA|/ɛː, eː/}} are shifted again to {{IPA|/eː, iː/}} in Early Modern English, causing merger of former {{IPA|/eː/}} with {{IPA|/iː/}}; but the two are still distinguished in spelling as ea, ee.{{sfn|Cercignani|1981}}
• Initial cluster reductions:
  • {{IPA|/wr/}} merges into {{IPA|/r/}}; hence rap and wrap become homophones.
• Doubled consonants reduced to single consonants.
• Loss of most remaining diphthongs.
  • {{IPA|/au/}} became {{IPA|/ɔː/}}, merging with the vowel in broad and the {{IPA|/ɔː/}} of the lot–cloth split below.
  • The long mid mergers: {{IPA|/ɛi, ɔu/}} are raised to {{IPA|/ei, ou/}}, eventually merging with {{IPA|/eː, oː/}}, so that pane and pain, and toe and tow, become homophones in most accents.
  • The above two mergers did not occur in many regional dialects as late as the 20th century (e.g. Northern England, East Anglia, South Wales, and even Newfoundland).{{sfn|Wells|1982|pp=192–94, 337, 357, 384–85, 498.}}
  • {{IPA|/y, ɛu, iu/}} merge to {{IPA|/iu/}}, so that dew (EME {{IPA|/dɛu/}} < OE dēaƿ), duke (EME {{IPA|/dyk/}} < Old French duc {{IPA|/dyk/}}) and new (EME {{IPA|/niu/}} < OE nīƿe) now have the same vowel.
  • This {{IPA|/iu/}} later becomes {{IPA|/juː/}} in standard varieties of English, and {{IPA|/uː/}} in some cases through Yod-dropping">yod-dropping.
  • {{IPA|/iu/}} remains in Welsh English and some other non-standard varieties.
  • {{IPA|/ɔi/}} and {{IPA|/ui/}} merge to {{IPA|/oi/}}, the only Middle English diphthong that remains in the modern standard English varieties.

Up to the American–British split

This period is estimated to be c. AD 1600–1725.{{citation needed|date=December 2014}}

• At some preceding time after Old English, all {{IPA|[r]}} become {{IPA|[ɹ]}}.
  • Evidence from Old English shows that, at that point, the pronunciation {{IPA|[ɹ]}} occurred only before a consonant.{{Citation needed|date=March 2012}}
  • Scottish English has {{IPA|[r]}} consistently.
• Initial cluster reductions:
  • {{IPA|/ɡn, kn/}} both merge into {{IPA|/n/}}; hence gnat and Nat become homophones; likewise not and knot.
• The foot–strut split: In southern England, {{IPA|/ʊ/}} becomes unrounded and eventually lowered unless preceded by a labial and followed by a non-velar.{{sfn|Dobson|1968|p=720}} This gives put {{IPA|[pʰʊt]}} but cut {{IPA|[kʰʌt]}} and buck {{IPA|[bʌk]}}. This distinction later become phonemicized by an influx of words shortened from {{IPA|/uː/}} to {{IPA|/ʊ/}} both before (flood, blood, glove) and after (good, hood, book, soot, took) this split.
• Ng-coalescence: Reduction of {{IPA|/ŋɡ/}} in most areas produces new phoneme {{IPA|/ŋ/}}.
• In some words, {{IPA|/tj, sj, dj, zj/}} coalesce to produce {{IPA|/tʃ, ʃ, dʒ/}}, and the new phoneme {{IPA|/ʒ/}}, a sound change known as yod-coalescence, a type of palatalization: nature, mission, procedure, vision.
  • These combinations mostly occurred in borrowings from French and Latin.
  • Pronunciation of -tion was {{IPA|/sjən/}} from Old French {{IPA|/sjon/}}, thus becoming {{IPA|/ʃən/}}.
  • This sound mutation still occurs allophonically in Modern English: did you {{IPA|/ˈdɪdjuː/}} → {{IPA|[ˈdɪdʒuː]}} didjou.
• Long vowels {{IPA|/eː, uː/}}, from ME {{IPA|/ɛː, oː/}}, inconsistently shortened, especially before {{IPA|/t, d, θ, ð/}}: sweat, head, bread, breath, death, leather, weather
  • Shortening of {{IPA|/uː/}} occurred at differing time periods, both before and after the centralizing of {{IPA|/ʊ/}} to {{IPA|/ʌ/}}; hence blood {{IPA|/blʌd/}} versus good {{IPA|/ɡʊd/}}: also foot, soot, blood, good.
• The meet–meat merger: Meet and meat become homophones in most accents.
• Changes affect short vowels in many varieties before an {{IPA|/r/}} at the end of a word or before a consonant
  • {{IPA|/a/}} as in start and {{IPA|/ɔ/}} as in north are lengthened.
  • {{IPA|/ɛ, ɪ, ʌ/}} merge before {{IPA|/r/}}, so all varieties of ModE except for some Scottish English and some Irish English have the same vowel in fern, fir and fur.
  • Also affects vowels in derived forms, so that starry no longer rhymes with marry.
• {{IPA|/a/}}, as in cat and trap, fronted to {{IPA|[æ]}} in many areas. In certain other words it becomes {{IPA|/ɑː/}}, for example father {{IPA|/ˈfɑːðər/}}. {{IPA|/ɑː/}} is actually a new phoneme deriving from this and words like calm (see above).
  • Most varieties of northern English English, Welsh English and Scottish English retain {{IPA|[a]}} in cat, trap etc.
• The lot–cloth split: in some varieties, lengthening of {{IPA|/ɔ/}} before voiced velars ({{IPA|/ŋ/}}, {{IPA|/ɡ/}}) (American English only) and voiceless fricatives ({{IPA|/s/}}, {{IPA|/f/}}, {{IPA|/θ/}}). Hence American English long, dog, loss, cloth, off with {{IPA|/ɔː/}} (except in dialects with the cot–caught merger where the split is made completely mute).
• {{IPA|/uː/}} becomes {{IPA|/ʊ/}} in many words spelt oo: for example, book, wool, good, foot. This is partially resisted in the northern and western variants of English English, where words ending in -ook might still use {{IPA|/uː/}}.{{sfn|Trudgill|2002|p=71}}

After American–British split, up to World War II

This period is estimated to be c. AD 1725–1945.

• Split into rhotic and non-rhotic accents: syllable-final {{IPA|/ɹ/}} is lost in the English of England, producing new centering diphthongs {{IPA|/ɛə/}} (square), {{IPA|/ɪə/}} (near), {{IPA|/ɔə/}} (cord), {{IPA|/oə/}} (sore), {{IPA|/ʊə/}} (cure), and the highly unusual phoneme {{IPA|/ɜː/}} (nurse).
  • The Southern Hemisphere varieties of English (Australian, New Zealand, and South African) are also non-rhotic.
  • Non-rhotic accents of North American English include New York City,^[1] Boston, and older Southern.
• Unrounding of {{sc2|LOT}}: {{IPA|/ɒ/}} as in lot and bother is unrounded in Norwich, the West Country, in Hiberno-English{{sfn|Wells|1982|pp=339–40, 419}} and most of North American English
  • The Boston accent is an exception where the {{sc2|LOT}} vowel is still rounded.{{sfn|Wells|1982|pp=245–47}}
  • In North American English, {{IPA|/ɒ/}} is typically also lengthened to merge with {{IPA|/ɑː/}} in father, resulting in the father–bother merger: so that most North American dialects only have the vowel {{IPA|/ɑː/}}.
  • Out of North American dialects that have unrounded {{sc2|LOT}}, the only notable exception is New York City.{{sfn|Wells|1982|pp=245–47}}
• The trap–bath split: in Southern England {{IPA|/æ/}} inconsistently becomes {{IPA|/ɑː/}} before {{IPA|/s, f, θ/}} and {{IPA|/n/}} or {{IPA|/m/}} followed by another consonant.
  • Hence RP has pass, glass, grass, class with {{IPA|/ɑː/}} but mass, crass with {{IPA|/æ/}}.
  • All six words rhyme in most American, Scottish English and Northern England English.
• The long vowels {{IPA|/eː oː/}} from the Great Vowel Shift become diphthongs {{IPA|/eɪ oʊ/}} in many varieties of English, though not in Scottish and Northern England English.
• Reduction of {{IPA|/hw/}} to {{IPA|/w/}} results in the wine–whine merger in most varieties of English, aside from Scottish, Irish, Southern American, and New England English.
• In American and Canadian English, and to some degree in Australian and New Zealand English, {{IPA|/t, d/}} are flapped or voiced to {{IPA|[ɾ]}} between vowels.
  • Generally, between vowels or the syllabic consonants {{IPA|[ɹ̩, l̩, m̩]}}, when the following syllable is completely unstressed: butter, bottle, bottom {{IPA|[ˈbʌɾɹ̩ ˈbɑɾl̩ ˈbɑɾm̩]}}.
  • But {{IPA|/t/}} before syllabic {{IPA|[n̩]}} is pronounced as a glottal stop, so cotton {{IPA|[kɑʔn̩]}}.
• Happy-tensing (the term is from Wells 1982): final lax {{IPA|[ɪ]}} becomes tense {{IPA|[i]}} in words like happ{{sc2|Y}}. Absent from some dialects.
• Line–loin merger: merger between the diphthongs {{IPA|/aɪ/}} and {{IPA|/ɔɪ/}} in some accents of Southern England English, Hiberno-English, Newfoundland English, and Caribbean English.
• H-dropping begins in England and Welsh English, but this does not affect the upper-class southern accent that developed into Received Pronunciation, nor does it affect the far north of England or East Anglia.{{sfn|Trudgill|2002|pp=28-30}}

After World War II

Some of these changes are in progress.

• Restoration of post-vocalic {{IPA|/r/}} in some non-rhotic accents of Southern American English^[2]
• Changes to the low front vowel {{IPA|/æ/}}
  • /æ/ raising: raising, lengthening or diphthongization of {{IPA|[æ]}} in some varieties of American English in particular contexts, especially before nasal consonants, resulting in {{IPA|[eə, ɪə, æɪ]}}. Some linguistics research suggests that /æ/ raising existed since the American colonial era, due to relic evidence of this feature in some of the Northern and Midland U.S.
  • Bad–lad split: the lengthening of {{IPA|[æ]}} to {{IPA|[æː]}} in some words, found especially in Australian English and to a degree in Southern English English.
  • Raising {{IPA|[æ]}} to {{IPA|[ɛ]}} in New Zealand and South African English.
  • Lowering to {{IPA|[a]}} in Received Pronunciation, Canadian English, and Western American English (except before nasal consonants).
• Lock–loch merger: the replacement of {{IPA|[x]}} with {{IPA|[k]}} among some younger Scottish English speakers from Glasgow [https://web.archive.org/web/20060512015006/http://www.arts.gla.ac.uk/SESLl/EngLang/research/accent/annex4.htm],  .
• Pin–pen merger: the raising of {{IPA|/ɛ/}} to {{IPA|/ɪ/}} before nasal consonants in Southern American English and southwestern varieties of Hiberno-English.
• Fronting of back vowels:
  • In many varieties of English, {{IPA|/uː/}} is fronted to {{IPA|[u̟]}}, {{IPA|[ʉː]}}, or {{IPA|[ɵu̯]}}
  • Resistance occurs in Northern American English and New York City English.^[3]
  • In British English and some American English, {{IPA|/oʊ/}} is fronted to {{IPA|[ɵʊ]}}, {{IPA|[əʊ]}}, or {{IPA|[ɛʊ]}}
  • Resistance occurs in Northern American English and ^[3] New York City English^[3].
• T-glottalization becomes increasingly widespread in Great Britain.{{sfn|Trudgill|2002|pp=77–78}}
• Various treatments of the th sounds, the dental fricatives {{IPA|/θ, ð/}}:
  • Th-fronting: merger with the labiodental fricatives {{IPA|/f, v/}}
  • Th-stopping: shift to dental stops {{IPA|[t̪, d̪]}}, or merger with alveolar stops {{IPA|[t, d]}}
  • Th-debuccalization: lenition to {{IPA|[h]}}
  • Th-alveolarization: merger with alveolar fricatives {{IPA|[s, z]}}
• L-vocalization: {{IPA|[l]}} changes to an approximant or vowel, such as {{IPA|[w]}}, {{IPA|[o]}} or {{IPA|[ʊ]}}. This occurs in Estuary English and other dialects.{{sfn|Trudgill|2002|pp=63–66}}
• Yod-dropping: loss of {{IPA|/j/}} in some consonant clusters.
• Northern Cities Vowel Shift in Inland Northern American English:
  • raising and tensing of {{IPA|/æ/}} (in reversal^[4][5][6] in many locations before non-nasal consonants)
  • fronting of {{IPA|/ɑ/}} (also somewhat in reversal)
  • lowering of {{IPA|/ɔ/}}
  • backing and lowering of {{IPA|/ɛ/}}
  • backing of {{IPA|/ʌ/}}
  • lowering and backing of {{IPA|/ɪ/}}
• Changes to centering diphthongs in non-rhotic varieties of English (England and Australia):
  • {{IPA|/ɪə, ɛə, ɑə, ɔə/}} smooth to {{IPA|[ɪː, ɛː, ɑː, ɔː]}}: near, square, start, north.
  • {{IPA|[ʊə]}} smooths to {{IPA|[ʊː]}}, breaks to {{IPA|[uː.ə]}},{{citation needed|date=March 2017}} or lowers and merges with {{IPA|/ɔː/}} (pour–poor merger):
  • Triphthongs {{IPA|[aɪə], [aʊə]}} smooth to {{IPA|[aː]}} or {{IPA|[ɑː]}} (tower–tire, tower–tar and tire–tar mergers).

Examples of sound changes

Summary of vowel developments

Development of Middle English vowels

Monophthongs

This table describes the main historical developments of English vowels in the last 1000 years, beginning with late Old English and focusing on the Middle English and Modern English changes leading to the current forms. It provides a lot of detail about the changes taking place in the last 600 years (since Middle English), while omitting any detail in the Old English and earlier periods. For more detail about the changes in the first millennium AD, see the section on the development of Old English vowels.

This table omits the history of Middle English diphthongs; see that link for a table summarizing the developments.

The table is organized around the pronunciation of Late Middle English c. 1400 AD (the time of Chaucer) and the modern spelling system, which dates from the same time and closely approximates the pronunciation of the time. (Modern English spelling originates in the spelling conventions of Middle English scribes and its modern form was largely determined by William Caxton, the first English printer (beginning in 1476).

As an example, the vowel spelled {{angbr|a}} corresponds to two Middle English pronunciations: {{IPA|/a/}} in most circumstances, but long {{IPA|/aː/}} in an open syllable, i.e. followed by a single consonant and then a vowel, notated aCV in the spelling column. (This discussion ignores the effect of trisyllabic laxing.) The lengthened variant is due to the Early Middle English process of open-syllable lengthening; this is indicated by (leng.). Prior to that time, both vowels were pronounced the same, as a short vowel {{IPA|/a/}}; this is reflected by the fact that there is a single merged field corresponding to both Middle English sounds in the Late Old English column (the first column). However, this earlier Middle English vowel {{IPA|/a/}} is itself the merger of a number of different Anglian Old English sounds:

1. the short vowels indicated in Old English spelling as {{angbr|a}}, {{angbr|æ}} and {{angbr|ea}};
2. the long equivalents {{angbr|ā}}, {{angbr|ēa}}, and often {{angbr|ǣ}} when directly followed by two or more consonants (indicated by ā+CC, ǣ+CC, etc.);
3. occasionally, the long vowel {{angbr|ē}} when directly followed by two consonants, particularly when this vowel corresponded to West Saxon Old English {{angbr|ǣ}}. (Middle English, and hence Modern English, largely derives from the Anglian dialect of Old English, but some words are derived from the West Saxon dialect of Old English, because the border between the two dialects ran through the London area. Note that the West Saxon dialect, not the Anglian dialect, is the "standard" dialect described in typical reference works on Old English.)

Moving forward in time, the two Middle English vowels {{IPA|/a/}} and {{IPA|/aː/}} correspond directly to the two vowels {{IPA|/a/}} and {{IPA|/ɛː/}}, respectively, in the Early Modern English of c. 1600 AD (the time of Shakespeare). However, each vowel has split into a number of different pronunciations in Modern English, depending on the phonological context. The short {{IPA|/a/}}, for example, has split into seven different vowels, all still spelled {{angbr|a}} but pronounced differently:

1. {{IPA|/æ/}} when not in any of the contexts indicated below, as in man, sack, wax, etc.
2. A vowel pronounced {{IPA|/ɑ/}} in General American (GA) and {{IPA|/ɒ/}} in Received Pronunciation (RP) when preceded by {{IPA|/w/}} and not followed by the velar consonants {{IPA|/k/, /ɡ/ or /ŋ/}}, as in swan, wash, wallow, etc. (General American is the standard pronunciation in the U.S. and Received Pronunciation is the most prestigious pronunciation in Britain. In both cases, these are the pronunciations typically found in news broadcasts and among the middle and upper classes.)
3. {{IPA|/ɑr/}} (GA) or {{IPA|/ɑː/}} (RP) when followed by a written {{angbr|r}}, as in hard, car, etc. (Note, this does not include words like care, where the {{angbr|a}} was pronounced as long {{IPA|/aː/}} in Middle English.)
4. But {{IPA|/ɔr/}} (GA) or {{IPA|/ɔː/}} (RP) when both preceded by {{IPA|/w/}} and followed by written {{angbr|r}}, as in war, swarm, etc.
5. {{IPA|/ɔː/}} when followed by an {{IPA|/l/}} plus either a consonant or the end of a word, as in small, walk, etc. (In the case of walk, talk, chalk, etc. the {{IPA|/l/}} has dropped out, but this is not indicated here. Note also that words like rally, shallow and swallow are not covered here because the {{IPA|/l/}} is followed by a vowel; instead, earlier rules apply. Nor are words like male covered, which had long {{IPA|/aː/}} in Middle English.)
6. {{IPA|/ɑ/}} (GA) or {{IPA|/ɑː/}} (RP) when followed by {{IPA|/lm/}}, as in palm, calm, etc. (Note that the {{IPA|/l/}} has dropped out in pronunciation.)
7. In RP only, the pronunciation {{IPA|/ɑː/}} is often found when followed by an unvoiced fricative, i.e. {{IPA|/f/}}, {{IPA|/s/}} or {{IPA|/θ/}} (but not {{IPA|/ʃ/}}), as in glass, after, path, etc. This does not apply to GA and also unpredictably does not affect a number of words of the same form, e.g. crass, math, etc.

Diphthongs

This table describes the main developments of Middle English diphthongs, starting with the Old English sound sequences that produced them (sequences of vowels and g, h or ƿ) and ending with their Modern English equivalents. Many special cases have been ignored.

Development of Old English vowels

See also

• English language
• History of the English language
• English phonology
• Phonological history of English consonants
  • Phonological history of English consonant clusters
• Phonological history of English vowels
  • Phonological history of English short A
  • Phonological history of English low back vowels
  • Phonological history of English high back vowels
  • Phonological history of English high front vowels
  • English-language vowel changes before historic /r/
  • English-language vowel changes before historic /l/
• Scottish vowel length rule
• Phonological history of Scots

Notes

References

• {{citation | last=Baker | first=Peter S. | title=Introduction to Old English | edition=2nd | location=Oxford | publisher=Blackwell | year=2007 | isbn=978-1-4051-5272-3}}.
• {{citation |url=ftp://ibiblio.org/pub/docs/books/gutenberg/etext97/bwulf10.txt |title=Beowulf |publisher=Project Gutenberg |others=translation by Francis Barton Gummere |deadurl=yes |archiveurl=https://web.archive.org/web/20050929050929/http://ibiblio.org/pub/docs/books/gutenberg/etext97/bwulf10.txt |archivedate=2005-09-29 |df= }}.
• {{citation | last=Campbell |first=A. | title=Old English Grammar | location=Oxford | publisher=Oxford University Press | year=1959 | isbn=0-19-811943-7}}.
• {{citation | last=Cercignani |first=Fausto | authorlink=Fausto Cercignani | title =The Development of /k/ and /sk/ in Old English | journal=Journal of English and Germanic Philology | volume=82 | number=3 | year=1983 | pages=313–323}}.
• {{citation | last=Cercignani |first=Fausto | authorlink=Fausto Cercignani | title =Shakespeare's Works and Elizabethan Pronunciation | location=Oxford |publisher=Clarendon Press |year=1981}}.
• {{citation |last=Dobson |first=E.J. |title=English pronunciation, 1500–1700 |volume=2 |url=https://books.google.com/books?id=AQkFQwAACAAJ |year=1968 |publisher=Clarendon Press |oclc=310545793 |location=Oxford}}.
• {{citation | last=Lass | first=Roger | title=Old English: A historical linguistic companion | location=Cambridge | publisher=Cambridge University Press | year=1994 | isbn=0-521-43087-9}}.
• {{citation | last1=Mitchell | first1=Bruce | last2=Robinson | first2=Fred C. | title=A Guide to Old English | edition=6th | location=Oxford | publisher=Blackwell | year=2001 | isbn=0-631-22636-2}}.
• {{citation |last=Plotkin |first=Vulf |authorlink=Vulf Plotkin |title=The Dynamics of the English Phonological System |publisher=Mouton |location=The Hague |year=1972}}.
• {{citation |last=Trudgill |first=Peter |authorlink=Peter Trudgill |title=The Dialects of England |publisher=Blackwell |location=Oxford |year=2002}}.
• {{citation |last=Wells |first=John C. |authorlink=John C. Wells |title=Accents of English |location=Cambridge |publisher=Cambridge University Press |year=1982 |isbn=0-521-22919-7 |id=(vol. 1). {{ISBN|0-521-24224-X}} (vol. 2)., {{ISBN|0-521-24225-8}} (vol. 3)}}.
• {{citation | last1=Labov | first1=William | last2=Ash | first2=Sharon | last3=Boberg | first3=Charles | title=The Atlas of North American English | year=2006 | publisher=Mouton-de Gruyter | location=Berlin | isbn=3-11-016746-8 | ref=harv}}

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