[ ih-fish-uhnt ]
/ 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

SYNONYMS FOR efficient


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for super-efficient

  • Its super-efficient cells eagerly gulped the rich radioactive substances.

    The Leech|Phillips Barbee
  • But now look what the firm is turning out under Trenton Lauren, old Bill's super-efficient son!

    Big Pill|Raymond Zinke Gallun
  • 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

/ (ɪˈfɪʃənt) /


functioning or producing effectively and with the least waste of effort; competent
philosophy producing a direct effect; causative

Derived forms of efficient

efficiently, adverb

Word Origin for efficient

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