RhymeZone

 

Definitions of preorder:
  • verb:   (transitive) To order (goods or services) in advance, before they are available.
  • verb:   (transitive) To sort or arrange beforehand.
  • noun:   An order for goods or services placed in advance.
  • noun:   (set theory, order theory) A binary relation that is reflexive and transitive.
  • adjective:   (computing theory, of a traversal of a tree) Such that, recursively, the root is visited before the left and right subtrees.

(Definitions from Wiktionary)

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