idempotentEnglishOxford Dictionary of Englishidempotent /ˌɪdɛmˈpəʊtnt , ˌʌɪdɛmˈpəʊtnt / Mathematics ▸ adjective denoting an element of a set which is unchanged in value when multiplied or otherwise operated on by itself. ▸ noun an idempotent element. – ORIGIN late 19th century: from Latin idem ‘same’ + potent1.