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

Asked whether tariffs and the Iran war were driving recent price increases, as several current Fed officials have argued, Warsh said the central bank could only affect things “that are not one-off in nature.”

From The Wall Street Journal • Apr. 22, 2026

The year-earlier quarter included $356 million in impairment and other one-off charges.

From The Wall Street Journal • Apr. 21, 2026

As one might say: this isn’t just a one-off occurrence across a small handful of companies—it’s an evolution in the way people are communicating in the age of AI.

From Barron's • Apr. 14, 2026

However, she said this meteor was a "one-off" event.

From BBC • Apr. 13, 2026

The paper giant I maybe could have ignored as a one-off freaky occurrence in a freaky place with freaky creatures.

From "Tristan Strong Punches a Hole in the Sky" by Kwame Mbalia