Definition of "preorder" [pre•or•der]

• To order (goods) in advance, before they are available. (verb)
• A binary relation that is reflexive and transitive. (noun)
• Of a tree traversal, recursively visiting the root before the left and right subtrees. (adjective)

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• "ETA: Well, crap, now the preorder is gone from the Amazon listing again, even though they have the price listed as $7.99."
• "Ms. Noonan is a contributing editor of The Wall Street Journal and author of "John Paul the Great: Remembering a Spiritual Father," forthcoming in November from Penguin, which you can preorder from the OpinionJournal bookstore."
• "Now, I'm not against the idea of preorder bonuses at all - I think it's great that customers be rewarded for their loyalty to favorite franchises, developers, or marketing campaigns."