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1. Acting or producing effectively with a minimum of waste, expense, or unnecessary effort: an efficient builder; an efficient factory.
2. Acting directly to produce an effect: the efficient cause of the revolution.
3. Causing less waste or requiring less effort than comparable devices or methods. Used in combination: energy-efficient wind turbines; cost-efficient health care.

[Middle English, from Old French, from Latin efficiēns, efficient-, present participle of efficere, to effect; see effect.]

ef·fi′cient·ly adv.


1. functioning or producing effectively and with the least waste of effort; competent
2. (Philosophy) philosophy producing a direct effect; causative
[C14: from Latin efficiēns effecting]
efˈficiently adv


(ɪˈfɪʃ ənt)

1. performing or functioning effectively with the least waste of time and effort; competent; capable: an efficient secretary.
2. satisfactory and economical to use: a more efficient air conditioner.
3. producing an effect, as a cause; causative.
4. using a given product or resource with maximum efficiency (used in combination): a fuel-efficient engine.
[1350–1400; Middle English (< Middle French) < Latin efficient-, s. of efficiēns]
ef•fi′cient•ly, adv.
syn: See effective.


1. 'effective'

If someone or something is effective, they do something well and produce the results that were intended.

We need effective street lighting.
Simple antibiotics are effective against this virus.
She was very effective in getting people to communicate.
2. 'efficient'

If someone or something is efficient, they do a job well and successfully, without wasting time or energy.

You need a highly efficient production manager if you want to reduce costs.
Engines and cars can be made more efficient.

Be Careful!
Effective and efficient are often confused, but they have slightly different meanings. If you are effective, you do a job properly; if you are efficient, you do it quickly and easily.

Doing research at the library can be effective, but using the internet is often more efficient.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.efficient - being effective without wasting time or effort or expense; "an efficient production manager"; "efficient engines save gas"
competent - properly or sufficiently qualified or capable or efficient; "a competent typist"
effective, effectual, efficacious - producing or capable of producing an intended result or having a striking effect; "an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation"-LewisMumford; "effective teaching methods"; "effective steps toward peace"; "made an effective entrance"; "his complaint proved to be effectual in bringing action"; "an efficacious law"
inefficient - not producing desired results; wasteful; "an inefficient campaign against drugs"; "outdated and inefficient design and methods"
2.efficient - able to accomplish a purpose; functioning effectively; "people who will do nothing unless they get something out of it for themselves are often highly effective persons..."-G.B.Shaw; "effective personnel"; "an efficient secretary"; "the efficient cause of the revolution"
competent - properly or sufficiently qualified or capable or efficient; "a competent typist"



1. Producing or able to produce a desired effect:
2. Acting effectively with minimal waste:
فَعَّالكُفء، قَدير، ماهِرناجِع، فَعّال
áhrifaríkur, skilvirkurhæfur, skilvirkur
hiệu quả


[ɪˈfɪʃənt] ADJ
1. [person, manager] → eficaz, eficiente; [method, remedy, product, system] → eficaz; [service, company, organization, army] → eficiente
to be efficient at doing sthser eficiente a la hora de hacer algo
2. (esp Mech, Phys) [machine] → de buen rendimiento


[ɪˈfɪʃənt] adj [person] → efficace; [method, means] → efficace; [machine, car] → d'un bon rendement


adj personfähig, tüchtig; system, machine, company, organizationleistungsfähig; car, engine (= powerful)leistungsfähig; (= economical)sparsam, verbrauchsarm; servicegut, effizient (geh); methodwirksam; way, userationell; work is organized in the most logical and efficient waydie Arbeit wird so logisch und rationell wie möglich organisiert; to be efficient in or at (doing) somethingetw gut können; she’s efficient at dealing with difficult customerssie kann gut mit schwierigen Kunden umgehen; the body is remarkably efficient at dealing with such thingsder Körper wird mit diesen Dingen bemerkenswert gut fertig; they are less efficient at turning sunlight into electricitybei der Umwandlung von Sonnenlicht in elektrischen Strom sind sie weniger effektiv


[ɪˈfɪʃnt] adj (person) → efficiente; (remedy, product, system) → efficace; (machine, car) → che ha un buon rendimento


(iˈfiʃənt) adjective
1. (of a person) capable; skilful. a very efficient secretary.
2. (of an action, tool etc) producing (quick and) satisfactory results. The new lawn mower is much more efficient than the old one.
efˈficiently adverb
efˈficiency noun


فَعَّال výkonný effektiv leistungsfähig αποδοτικός eficiente tehokas efficace djelotvoran efficiente 効率的な 효율적인 efficiënt effektiv skuteczny eficiente эффективный effektiv ซึ่งมีประสิทธิภาพ etkin hiệu quả 效率高的


a. eficaz; eficiente;
adv. eficientemente.
References in classic literature ?
Inquiries next morning brought the information, from the head of a rubber exporting firm with whom the professor was acquainted, that the Spaniard was regularly engaged in transporting parties into the interior, and was considered efficient, careful and as honest as pos- sible, considering the men he engaged as workers.
Phoebe and the fire that boiled the teakettle were equally bright, cheerful, and efficient, in their respective offices.
but, besides the application to him of the generic remark above, this carpenter of the Pequod was singularly efficient in those thousand nameless mechanical emergencies continually recurring in a large ship, upon a three or four years' voyage, in uncivilized and far-distant seas.
All day long this man would toil thus, his whole being centered upon the purpose of making twenty-three instead of twenty-two and a half cents an hour; and then his product would be reckoned up by the census taker, and jubilant captains of industry would boast of it in their banquet halls, telling how our workers are nearly twice as efficient as those of any other country.
Her father, scarce knowing what he did, was plunging in after her, but was held back by some behind him, who saw that more efficient aid had followed his child.
The business end of the funeral of the late Sir Dalliance the duke's son of Cornwall, killed in an encounter with the Giant of the Knotted Bludgeon last Tuesday on the borders of the Plain of Enchantment was in the hands of the ever affable and efficient Mumble, prince of un3ertakers, then whom there exists none by whom it were a more satisfying pleasure to have the last sad offices performed.
It is certainly a very remarkable fact, that one of the most efficient advocates of the slave population, now before the public, is a fugitive slave, in the person of FREDERICK DOUGLASS; and that the free colored population of the United States are as ably represented by one of their own number, in the per- son of CHARLES LENOX REMOND, whose eloquent appeals have extorted the highest applause of multi- tudes on both sides of the Atlantic.
And if you are inclined to despise the day of small things, seek some more efficient succour than such as I can offer.
Quarrel with Edgar, if you please, Heathcliff, and deceive his sister: you'll hit on exactly the most efficient method of revenging yourself on me.
Pumblechook pledged himself over and over again to keep Joseph up to the mark (I don't know what mark), and to render me efficient and constant service (I don't know what service).
And neither did any legislature, or city council, come forward to the task of giving the people a cheap and efficient telephone service.
For the absurdity must continually stare us in the face of confiding to a government the direction of the most essential national interests, without daring to trust it to the authorities which are indispensible to their proper and efficient management.

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