Dictionary

The one or single occasion; the present reason or purpose (now only in for the nonce).

Example: That will do for the nonce, but we'll need a better answer for the long term.

A nonce word.

Example: I had thought that the term was a nonce, but it seems as if it's been picked up by other authors.

A value constructed so as to be unique to a particular message in a stream, in order to prevent replay attacks.

One-off; produced or created for a single occasion or use. Denoting something occurring once.

(prisons) A sex offender, especially one who is guilty of sexual offences against children.

Example: 1989 "assorted nonces, ponces and murderers, 'the worst men in the world' [...] on the nonce wing, where the child-killers, molesters and various perverts have to be protected from the other prisoners." (New Statesman, New Society, Volume 2, Statesman & Nation Publishing Company Limited)

(prisons) A police informer, one who betrays a criminal enterprise

A stupid or worthless person.

Example: Shut it, ya nonce!