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idempotent

Flag: gbEnglishOxford New American Dictionary
idempotent /ˌīdemˈpōt(ə)nt, , ˌaɪdɛmˈpoʊt(ə)nt , ˈēdemˌpōt(ə)nt, ˈidɛmˌpoʊt(ə)nt / 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.