Energeia First recorded in 1599, from Middle French energie, from Late Latin energia, which was from Greek energeia, "efficiency, activity, operation" came from energos, "active, working" from en-, "at" + ergon, "work". Used by Aristotle with a sense of "force of expression"; the broader meaning of "power" was first recorded in English in 1665. To energize; that is, "rouse to activity" is from 1753; energetic of people, institutions, etc., is from 1796. The term energy crisis was first recorded in 1970.