Etymology
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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.

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Definitions of efficient

efficient (adj.)
being effective without wasting time or effort or expense;
efficient engines save gas
an efficient production manager
efficient (adj.)
able to accomplish a purpose; functioning effectively; "people who will do nothing unless they get something out of it for themselves are often highly effective persons..."-G.B.Shaw;
the efficient cause of the revolution
an efficient secretary
Synonyms: effective
From wordnet.princeton.edu