• synonyms


  1. 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.
  2. satisfactory and economical to use: Our new air conditioner is more efficient than our old one.
  3. producing an effect, as a cause; causative.
  4. utilizing a particular commodity or product with the least waste of resources or effort (usually used in combination): a fuel-efficient engine.
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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 formsef·fi·cient·ly, adverbnon·ef·fi·cient, adjectivenon·ef·fi·cient·ly, adverbqua·si-ef·fi·cient, adjectivequa·si-ef·fi·cient·ly, adverbsu·per·ef·fi·cient, adjectiveun·ef·fi·cient, adjective


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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


  1. functioning or producing effectively and with the least waste of effort; competent
  2. philosophy producing a direct effect; causative
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Derived Formsefficiently, 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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper