one-off

American  

adjective

1. done, occurring, or made only once; one-shot.

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noun

1. something occurring, done, or made only once.

one-off British  

noun

1. Also: one-shot. 

   1. something that is carried out or made only once

   2. ( as modifier )

      a one-off job

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Etymology

Origin of one-off

First recorded in 1935–40

Example Sentences

While each nation has slightly different plans, the one-off MenB vaccination programme will broadly be available to:

From BBC • Jun. 11, 2026

They won't have too many weaknesses and, when we get to the knockout stage, they are capable of beating anyone in a one-off game.

From BBC • Jun. 10, 2026

This 16% fluctuation then is pretty dramatic, but it’s not a one-off.

From MarketWatch • Jun. 9, 2026

Applicants for so-called golden visas in Europe may need to make nonrefundable investments of between $170,000 and $900,000 in projects deemed to be of national interest such as local company shares or one-off government contributions.

From Barron's • Jun. 7, 2026

“Anyone can buy a one-off expensive car,” said Paul Nunes, who with Brian Johnson wrote Mass Affluence, a book on marketing strategies.

From "Class Matters" by The New York Times