c. 1600, from Latinized form of Greek entelekheia "actuality," from en "in" (see en- (2)) + telei, dative of telos "perfection" (see tele-) + ekhein "to have" (see scheme (n.)). In Aristotle, "the condition in which a potentiality has become an actuality."[entelechy etymology, entelechy origin, 英语词源]