Definitions from Wiktionary (nonce)

▸ noun:  The one or single occasion; the present reason or purpose (now only in for the nonce).
▸ noun:  (lexicography) A nonce word.
▸ noun:  (cryptography) A value constructed so as to be unique to a particular message in a stream, in order to prevent replay attacks.
▸ adjective:  One-off; produced or created for a single occasion or use. Denoting something occurring once.
▸ noun:  (British, Ireland, derogatory) A sex offender, especially one who is guilty of sexual offences against children.
▸ noun:  (by extension) A pedophile.
▸ noun:  (British, Ireland, prison slang, derogatory) A police informer, one who betrays a criminal enterprise
▸ noun:  (British, Ireland, slang, derogatory) A stupid or worthless person.

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