Ef*fi"cience (?), Ef*fi"cien*cy (?), n. [L. efficientia.]


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.


Efficiency of a heat engine, the ratio of the work done an engine, to the work due to the heat supplied to it.


© Webster 1913.