Entelechy is a philosophical concept of Aristotle. The term traces to the Ancient Greek wor entelecheia, from the combination of the Greek words enteles (complete), telos (end, purpose, completion) and echein (to have). Aristotle coined the word, which could possibly be translated in English as, "having the end within itself." To Aristotle, entelecheia referred to a certain state or sort of being, in which a thing was actively working to be itself. See Metaphysics, where it is contrasted with energeia.