idempotent
idempotent[ˌʌɪdɛmˈpəʊt(ə)nt, ʌɪˈdɛmpət(ə)nt](Mathematics)(数)adjective- denoting an element of a set which is unchanged in value when multiplied or otherwise operated on by itself
幂等的,等幂的
noun- an element of this type
幂等,等幂,等幂元
语源- late 19th cent.: from Latin idem 'same' + potent
考试词汇表