PREORDER

Preorder

In mathematics, especially in order theory, a preorder or quasiorder is a binary relation that is reflexive and transitive. All partial orders and equivalence relations are preorders, but preorders are more general.

The above text is a snippet from Wikipedia: Preorder
and as such is available under the Creative Commons Attribution/Share-Alike License.

Pre-order

A pre-order is an order placed for an item which has not yet been released. The idea for pre-orders came when people found it hard to get popular items in stores due to their popularity. Companies were then given the idea to allow people to reserve their own personal copy, before the release, which has been a huge success. Pre-orders allow consumers to guarantee immediate shipment on release, manufacturers can gauge how much demand there will be and hence how large initial production runs should be, and sellers can be assured of minimum sales. Additionally, high pre-order rates can be used to further increase sales.

The above text is a snippet from Wikipedia: Pre-order
and as such is available under the Creative Commons Attribution/Share-Alike License.

preorder

Noun

  1. A binary relation that is reflexive and transitive.
    The relation of logical implication over sentences is an example of a preorder.

Verb

  1. To order (goods) in advance, before they are available.

Adjective

  1. Of a tree traversal, recursively visiting the root before the left and right subtrees.


The above text is a snippet from Wiktionary: preorder
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!