Preorder meaning

prēôrdər
To order (an item) prior to the official release or sale date, for later delivery.
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The act or an instance of preordering.
noun
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A preordered item.
noun
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To order (goods) in advance, before they are available.
verb
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(set theory) A binary relation that is reflexive and .

The relation of logical implication over sentences is an example of a preorder.

noun
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(computing theory) Of a tree traversal, recursively visiting the root before the left and right subtrees.
adjective
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Origin of preorder

  • pre- +‎ order
    From Wiktionary