Definitions from Wiktionary (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.





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