| 释义 |
{{wiktionary|preorder}} The term preorder may refer to: In mathematics: - Preorder, a reflexive, transitive relation
- Preorder field, a field of sets structure on a set with preorder
- Preordered field, a field with a preorder
- Preordering, a vertex ordering from a tree or other graph traversal; see Depth-first search#Vertex orderings
In marketing: - Pre-order – an order placed for an item which has not yet been released.
{{disambiguation}} |