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Synonyms

efficient

American  
[ih-fish-uhnt] / ɪˈfɪʃ ənt /

adjective

  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.

    Synonyms:
    effectual
  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.


efficient British  
/ ɪˈfɪʃənt /

adjective

  1. functioning or producing effectively and with the least waste of effort; competent

  2. philosophy producing a direct effect; causative

"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

Usage

What are other ways to say efficient? A person or a thing that is efficient performs or functions in the best possible manner with the least waste of time and effort. But efficient isn’t quite the same as effectual, efficacious, or effective! Find out why on Thesaurus.com. 

Other Word Forms

  • efficiently adverb
  • nonefficient adjective
  • quasi-efficient adjective
  • superefficient adjective
  • unefficient adjective

Etymology

Origin of efficient

First recorded in 1350–1400; Middle English, from Middle French, from Latin efficient- (stem of efficiēns ), equivalent to ef- ef- + fic-, combining form of facere “to make, do 1 ” + -ent- -ent

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The advance could help open the door to the first neuromorphic supercomputer, offering a new path toward energy efficient computing for national security and other critical applications.

From Science Daily

Fighting with the IRS after filing a tax return is not efficient or pleasant, Zareh noted.

From MarketWatch

Edgecombe, who has emerged as one of the league's most efficient performers in "clutch" time -- the final five minutes of close games -- was named Most Valuable Player of the challenge.

From Barron's

Sometimes the least efficient dinner of the year is doing something dinner was never meant to do: turn love into proof.

From The Wall Street Journal

Algorhythm Holdings —formerly the Singing Machine Co.— published a white paper claiming its AI technology could make trucking more efficient.

From Barron's