ons
- A colloquial term for a one-night stand, which is a single sexual encounter between two people who do not expect to have a lasting relationship. nounAfter the party, they ended up having an ons.He wasn't looking for a relationship, just an occasional ons.
- In computing, an abbreviation for 'operating system', which is software that manages computer hardware and software resources and provides common services for computer programs. nounThe developer was working on a new ons to improve system performance.Different devices may require different ons to function properly.