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ODEidempotent

idempotent

Flag: gbEnglishOxford Dictionary of English

idempotent /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.