One-off (adjective)

Done or made for a single occasion or purpose, not repeated.

Origin:

The term 'one-off' is derived from the combination of the word 'one' and the word 'off', meaning happening or done only once.

Examples:

1. The one-off concert was a rare opportunity to see the famous musician perform.
2. The one-off event was organized to raise money for charity.
3. The one-off payment was made to cover the unexpected expenses.
4. The one-off project was completed within the deadline and received positive feedback.
5. The one-off deal was made to purchase the limited edition item.