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

The company said Tuesday the new program is designed to provide continuing medical supervision—allowing clinicians to monitor progress, adjust treatments and address related health conditions—compared with one-off weight-management solutions from other providers.

From The Wall Street Journal • Apr. 21, 2026

And you can compare among a growing array of virtual options for one-off visits at a cash price.

From The Wall Street Journal • Apr. 18, 2026

"The thought behind this is because it's a one-off prom, it's cost efficient instead of buying it all new," she added.

From BBC • Apr. 16, 2026

Businesses that can convert affection into recurring purchases—through character IP, licensing, events, memberships, accessories, and constant product refreshes—could be better positioned than brands still relying on one-off transactions.

From Barron's • Apr. 11, 2026

As originally conceived, in 2003, the subprime mortgage credit default swap was a one-off, nonstandard insurance contract, struck between Morgan Stanley and some other bank or insurance company, outside the gaze of the wider market.

From "The Big Short" by Michael Lewis