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

Carrie said: "Grayce's age when she was diagnosed, she couldn't get gene therapy, which would have been a one-off and she probably would have been making her milestones."

From BBC

Some people have panic attacks as one-offs while others might have them as part of other mental health problems such as obsessive-compulsive disorder or generalised anxiety disorder.

From BBC

A one-off rise in prices—for example, because of oil or tariffs—causes lasting inflation only if it works its way into other prices and wages.

From The Wall Street Journal

“All of this suggests that the Fed’s inflation worries extend beyond weathering a fleeting wave of one-off price hikes associated with tariffs and, more recently, an energy price spike,” Stanley says.

From Barron's

“You get no economy of scale with the traditional ferry industry because it’s very much a one-off,” Hasselskog said.

From The Wall Street Journal