Definify.com
Webster 1913 Edition
efficiency
{
ef-fi′cience
(ĕf-fĭsh′ens)
, ef-fi′cien-cy
(ĕf-fĭsh′en-sy̆)
, } Noun.
[L.
efficientia
.] 1.
The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
The manner of this divine
efficiency
being far above us. Hooker.
2.
(Mech.)
The ratio of useful work to energy expended.
Rankine.
efficiency of a heat engine
, the ratio of the work done by an engine, to the work due to the heat supplied to it.