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In the United Kingdom, nonce is a slang word for a sex offender or child sexual abuser. Nonce also means "now" in ordinary English, though this usage is rare, and has other meanings in the terms "nonce word" and "cryptographic nonce".
Usage in English prisons
Nonce first came into widespread use in UK prisons, where it is primarily used by prisoners to refer to convicted sex offenders, especially abusers of children. "Nonces" are traditionally targets of physical abuse from their prison inmates, and so usually go on Rule 45 (formerly Rule 43), the rule that enables the segregation of vulnerable prisoners from the other prisoners for their own safety. The Rule 45 section of British prisons in which sex offenders are segregated (also known as going on 'The Numbers' or, in rhyming slang, 'The Cucumbers') is often referred to as the "nonce wing".
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The Oxford English Dictionary, while describing the word's etymology as "Origin unknown", states that it is "perhaps related to" nance and cites a quotation which claims the word was derived from nancy-boy (a derogatory term referring to effeminate or homosexual males). It also suggests that it may derive from the nonse, Lincolnshire dialect for "good-for-nothing fellow".
It is widely believed in the UK that nonce is an acronym for Not On Normal Courtyard Exercise, a restriction sometimes applied to segregated sex offenders in prisons, but this is likely to be a backronym.