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

Scholey points out the NHU has developed numerous other wildlife presenters, but Attenborough is "a one-off, you'll never replicate him".

From BBC • May 9, 2026

He said he was convinced a "fundamental change" was happening in which voters "aren't just coming to us for a one-off, they're now becoming Reformers in every way".

From BBC • May 8, 2026

Adjusted pretax profit—a metric which strips out exceptional and other one-off items—was flat at 483 million pounds.

From The Wall Street Journal • Apr. 30, 2026

What began as a one-off backyard show quickly evolved into a monthly live event series that pops up in local warehouses, art galleries and cocktail bars.

From Los Angeles Times • Apr. 29, 2026

The Ministry had arranged this one-off connection to the Floo Network to return students quickly and safely to the school.

From "Harry Potter and the Half-Blood Prince" by J.K. Rowling