[en.er.gy] n, pl -gies [LL energia, fr. Gk energeia activity, fr. energos active, fr. en in + ergon work--more at work] (1599) 1 a: dynamic quality "narrative ~" b: the capacity of acting or being active "intellectual ~"
2: vigorous exertion of power: effort "investing time and ~"
3: the capacity for doing work
4: usable power (as heat or electricity); also: the resources for producing such power syn see power