efficient
Americanadjective
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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
-
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.
adjective
-
functioning or producing effectively and with the least waste of effort; competent
-
philosophy producing a direct effect; causative
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.
Magyar's promise to build "a more humane, efficient country" resonates with all those fed up with the governing party, especially the young.
From BBC • Apr. 3, 2026
I realized I had become a highly efficient machine for other people’s needs and had lost track of my own.
From Los Angeles Times • Apr. 3, 2026
The optical wireless system uses laser sources that are inherently energy efficient and capable of high-speed operation without complex power demands.
From Science Daily • Apr. 2, 2026
But more efficient vehicles in the United States combined with the country's domestic energy production means the "US is now energy sufficient overall," said Patrick Anderson, CEO of the research group.
From Barron's • Apr. 1, 2026
But Westinghouse, whose AC system was inherently cheaper and more efficient, bid $399,000.
From "The Devil in the White City" by Erik Larson
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
