nonce /nɒns $ nɑːns/
adjective [only before noun] technical[
Date: 1100-1200;
Origin: then anes 'the one purpose', mistaken for the nanes; anes from an 'one' ( ⇒ one3)]
a nonce word or phrase has been invented for a particular occasion and is only used once
[TahlilGaran] Dictionary of Contemporary English ▲