one-off

Meaning

Adj

1. Occurring once, independent of any pattern; one-time.
2. Singular; unique; special; remarkable.

Noun

1. (Commonwealth, idiomatic) Something that is done, created, etc. only once, and often quickly, simply, or improvisationally.
2. Something unique and remarkable.

Synonyms

one-shot

single

exclusive

sole

unique

one-of-a-kind

single-piece

Translations

eenmalig

ponctuel

unique

ci-devant

non récurrent

uniek

voormalige

isolado

único

aislado

pristino

sabık

Etymology

From one + off. Probably from foundry work, for which making reusable molds is expensive and expediency makes the rule for molds not to be used only once.
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.