For noun: from Middle English effect, from Old French effect (modern French effet), from Latin effectus ("an effect, tendency, purpose"), from efficiō; see effect as a verb. Replaced Old English fremming, fremednes from fremman.
For verb: from Middle English effecten, partly from Latin effectus, perfect passive participle of efficiō, from ex + faciō (see fact and compare affect, infect) and partly from the noun effect.
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