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[ih-fish-uh nt] /ɪˈfɪʃ ənt/
performing or functioning in the best possible manner with the least waste of time and effort; having and using requisite knowledge, skill, and industry; competent; capable:
a reliable, efficient assistant.
satisfactory and economical to use:
Our new air conditioner is more efficient than our old one.
producing an effect, as a cause; causative.
utilizing a particular commodity or product with the least waste of resources or effort (usually used in combination):
a fuel-efficient engine.
Origin of efficient
1350-1400; Middle English (< Middle French) < Latin efficient- (stem of efficiēns), equivalent to ef- ef- + fic-, combining form of facere to make, do1 + -ent- -ent
Related forms
efficiently, adverb
nonefficient, adjective
nonefficiently, adverb
quasi-efficient, adjective
quasi-efficiently, adverb
superefficient, adjective
unefficient, adjective
1. effectual. See effective. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for super-efficient
Historical Examples
  • But now look what the firm is turning out under Trenton Lauren, old Bill's super-efficient son!

    Big Pill Raymond Zinke Gallun
  • Its super-efficient cells eagerly gulped the rich radioactive substances.

    The Leech Phillips Barbee
  • Mrs. Horace A. Gower rather prided herself on the noiseless, super-efficient operation of her domestic machinery.

    Poor Man's Rock Bertrand W. Sinclair
British Dictionary definitions for super-efficient


functioning or producing effectively and with the least waste of effort; competent
(philosophy) producing a direct effect; causative
Derived Forms
efficiently, adverb
Word Origin
C14: from Latin efficiēns effecting
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for super-efficient



"capable of producing the desired effect," late 14c., "making, producing immediate effect," from Old French efficient and directly from Latin efficientem (nominative efficiens) "effective, efficient, producing, active," present participle of efficere "work out, accomplish" (see effect). Meaning "productive, skilled" is from 1787. Related: Efficiently.

Online Etymology Dictionary, © 2010 Douglas Harper
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