pre-order
/P R IY1 AO0 R D ER0/noun
- 1
An order for goods or services placed in advance.
- 2
A binary relation that is reflexive and transitive.
“The relation of logical implication over sentences is an example of a preorder.”
Synonyms
verb
- 1
To order (goods or services) in advance, before they are available.
- 2
To sort or arrange beforehand.
adjective
- 1
(of a traversal of a tree) Such that, recursively, the root is visited before the left and right subtrees.
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Source: https://en.wiktionary.org/wiki/pre-order, https://en.wiktionary.org/wiki/preorder