one-off

The definition of a one-off is something that happens only a single time.

(noun)

An example of a one-off is an experiment that works out once.

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See one-off in Webster's New World College Dictionary

adjective

happening, made, done, etc. only once; not repeated

noun

something that is one of a kind, not part of a series, etc.

See one-off in American Heritage Dictionary 4

adjective
Happening, done, or made only once.
noun
Something that is not repeated or reproduced.

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