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

Net income beat consensus after a higher-than-expected one-off dividend payment from Wintershall-DEA, the business it sold to Harbour Energy for cash and stock.

From The Wall Street Journal

“The catch is that this is a one-off fix for what is a systemic problem,” he said.

From Los Angeles Times

"The offence wasn't a one-off – it went on for a number of months and the card was sent."

From BBC

It was impacted by tariffs, but that is a one-off hit.

From Barron's

The trade-in subsidies were a one-off payment earlier depending on the car type.

From The Wall Street Journal