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efficiency (n.)

1590s, "power to accomplish something," from Latin efficientia "efficient power; efficiency; influence" (from efficientem; see efficient) + -cy. In mechanics, "ratio of useful work done to energy expended," from 1858. Attested by 1951 as short for efficiency apartment (itself from 1917).

Entries related to efficiency

efficient (adj.)
late 14c., "making, producing immediate effect, active, effective," from Old French efficient and directly from Latin efficientem (nominative efficiens) "effective, efficient, producing, active," present participle of efficere "work out, accomplish," from assimilated form of ex "out" (see ex-) + facere "to do" (from PIE root *dhe- "to set, put"). Meaning "productive, skilled" is from 1787. Related: Efficiently.
-cy 
abstract noun suffix of quality or rank, from Latin -cia, -tia, from Greek -kia, -tia, from abstract ending -ia (see -ia) + stem ending -c- or -t-. The native correspondents are -ship, -hood.
inefficiency (n.)
1749; see in- (1) "not, opposite of" + efficiency (n.).

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Definitions of efficiency

efficiency (n.)
the ratio of the output to the input of any system;
efficiency (n.)
skillfulness in avoiding wasted time and effort;
she did the work with great efficiency
From wordnet.princeton.edu

Dictionary entries near efficiency

effervescence

effervescent

effete

efficacious

efficacy

efficiency

efficient

effigy

effleurage

effloresce

efflorescence

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