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one-off

noun

noun Definition from WordNet 3.1, Princeton University. More about one-off at Wordnik → Where our words come from →

  1. A happening that occurs only once and is not repeated.

Origin

From one + off. Probably from foundry work, in which molds are expensive and generally made to be reusable. A term long used by artists who are printmakers and sculptors to indicate a unique print or casting. If using traditional edition numbering, a one-off would be a "1/1", which is said, "one of one" meaning the first print in an edition of one.

From Wiktionary, via Kaikki.org (CC BY-SA)