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a. Having an intended or expected effect.
b. Producing a strong impression or response; striking: gave an effective performance as Othello.
2. Operative; in effect: The law is effective immediately.
3. Existing in fact; actual: a decline in the effective demand.
4. Prepared for use or action, especially in combat.
A soldier or a piece of military equipment that is ready for combat.

ef·fec′tive·ness, ef′fec·tiv′i·ty n.
Synonyms: effective, effectual, efficacious
These adjectives mean producing or capable of producing a desired effect: an effective reprimand; an effectual complaint; an efficacious remedy.


1. productive of or capable of producing a result
2. in effect; operative: effective from midnight.
3. producing a striking impression; impressive: an effective entrance.
4. (prenominal) actual rather than theoretical; real: the effective income after deductions.
5. (Military) (of a military force, etc) equipped and prepared for action
6. (General Physics) physics (of an alternating quantity) having a value that is the square root of the mean of the squares of the magnitude measured at each instant over a defined period of time, usually one cycle. See also root mean square
(Military) a serviceman who is equipped and prepared for action
efˈfectively adv
efˈfectiveness, effectivity n


(ɪˈfɛk tɪv)

1. adequate to accomplish a purpose; producing the intended or expected result: effective teaching methods.
2. in operation or in force; functioning; operative: The law becomes effective at midnight.
3. producing a deep or vivid impression; striking: an effective photograph.
4. prepared and available for service, esp. military service.
5. a member of the armed forces fit for duty or active service.
[1350–1400; Middle English < Latin effectīvus=effect(us), past participle of efficere (see effect) + -īvus -ive]
ef•fec′tive•ly, adv.
ef•fec′tive•ness, ef•fec•tiv′i•ty, n.
syn: effective, effectual, efficacious, efficient refer to that which produces or is able to produce an effect. effective is applied to something that produces a desired or expected effect, often a lasting one: an effective speech. effectual usu. refers to something that produces a decisive outcome or result: an effectual settlement. efficacious refers to something capable of achieving a certain end or purpose: an efficacious remedy. efficient, usu. used of a person, implies skillful accomplishment of a purpose with little waste of effort: an efficient manager.


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.effective - 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"
efficacious - marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
efficient - being effective without wasting time or effort or expense; "an efficient production manager"; "efficient engines save gas"
potent, stiff, strong - having a strong physiological or chemical effect; "a potent toxin"; "potent liquor"; "a potent cup of tea", "a stiff drink"
powerful - having great power or force or potency or effect; "the most powerful government in western Europe"; "his powerful arms"; "a powerful bomb"; "the horse's powerful kick"; "powerful drugs"; "a powerful argument"
useful, utile - being of use or service; "the girl felt motherly and useful"; "a useful job"; "a useful member of society"
ineffective, ineffectual, uneffective - not producing an intended effect; "an ineffective teacher"; "ineffective legislation"
2.effective - 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"
3.effective - works well as a means or remedy; "an effective reprimand"; "a lotion that is effective in cases of prickly heat"
efficacious - marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
4.effective - exerting force or influence; "the law is effective immediately"; "a warranty good for two years"; "the law is already in effect (or in force)"
operative - being in force or having or exerting force; "operative regulations"; "the major tendencies operative in the American political system"
5.effective - existing in fact; not theoretical; real; "a decline in the effective demand"; "confused increased equipment and expenditure with the quantity of effective work done"
actual, existent - presently existing in fact and not merely potential or possible; "the predicted temperature and the actual temperature were markedly different"; "actual and imagined conditions"
6.effective - ready for service; "the fort was held by about 100 effective soldiers"
armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"
operational - (military) of or intended for or involved in military operations


2. powerful, strong, convincing, persuasive, telling, impressive, compelling, potent, forceful, striking, emphatic, weighty, forcible, cogent You can't make an effective argument if all you do is stridently voice your opinion.
powerful weak, tame, pathetic, powerless, feeble, ineffectual
3. virtual, essential, practical, implied, implicit, tacit, unacknowledged They have had effective control of the area.
4. in operation, official, current, legal, real, active, actual, in effect, valid, operative, in force, in execution The new rules will become effective in the next few days.
in operation inactive, inoperative


1. Producing or able to produce a desired effect:
2. Full of or displaying force:
3. In effect:
فَعّالفَعَّالفِعْلي، فَعّالمُثير
effektivvirkningsfuldaktivblive gyldig
áhrifamikillárangursríkurvirkur, í gildi
etkiliyürürlüğe girmişyürürlükteetkileyici
hiệu quả


1. (= efficient, useful) [treatment, method, deterrent, system] → efectivo, eficaz; [remark, argument] → eficaz
the method is simple, but effectiveel método es simple pero efectivo or eficaz
to be effective against sth [drug] → ser eficaz contra algo
effective capacity (Tech) → capacidad f útil
to be effective in doing sthser eficaz para hacer algo
effective life (Pharm) → vida f útil
effective power (Tech) → potencia f real
effective ways of reducing pollutionformas fpl efectivas or eficaces de reducir la polución
2. (= striking) [display, outfit, decoration] → impresionante, logrado; [combination] → logrado
to look effectivecausar efecto
blinds can look very effectivelas persianas pueden causar muy buen efecto or mucho efecto
3. (= operative)
to become effectiveentrar en vigor, hacerse efectivo (from, on a partir de)
effective datefecha f de vigencia, fecha f efectiva
it will be effective from April 1entrará en vigor or será efectivo a partir del 1 de abril
4. (= actual) [aid, contribution, leader] → real; [control, increase] → efectivo; [income] → en efectivo
5. (Econ, Fin) [demand, interest rate] → efectivo
B. effectives NPL (Mil) → efectivos mpl


[ɪˈfɛktɪv] adj
(= efficient) [method, way] → efficace
(= successful) [treatment] → efficace
to be effective against sth [drug] → être efficace contre qch
[control, command] → effectif/ive
(= striking) [display, outfit] → frappant(e), qui produit de l'effet, qui fait de l'effet
to become effective [law, agreement] → entrer en vigueur, prendre effet
effective date → date f d'effet, date f d'entrée en vigueur


(= successful) way, method, action, measureseffektiv, wirksam; means, treatment, vaccine, deterrentwirksam; strategy, policy, government, politicianeffektiv; to be effective in pain reliefSchmerzlinderung bewirken; to be effective in doing somethingbewirken, dass etw geschieht; to be effective against something (drug) → gegen etw wirken
(= striking) decoration, pattern, combinationwirkungsvoll; to look effectivewirkungsvoll aussehen, gut wirken
(= actual) control, increaseeffektiv, tatsächlich; (Econ, Fin) demand, interest rateeffektiv, tatsächlich; leadereigentlich; incomewirklich, tatsächlich; they have effective control of the areasie haben das Gebiet praktisch unter Kontrolle
(= operative)wirksam, in Kraft; a new law, effective from or becoming effective on 1 Augustein neues Gesetz, das am 1. August in Kraft tritt; effective dateInkrafttreten nt
(Mil) troopseinsatzbereit


[ɪˈfɛktɪv] adj
a. (efficient) → efficace
to become effective (Law) → entrare in vigore
b. (striking, display, outfit) → che fa colpo
c. (actual) → effettivo/a
effective date → data d'entrata in vigore


(iˈfekt) noun
1. a result or consequence. He is suffering from the effects of over-eating; His discovery had little effect at first.
2. an impression given or produced. The speech did not have much effect (on them); a pleasing effect.
to make happen; to bring about. He tried to effect a reconciliation between his parents.
efˈfective (-tiv) adjective
1. having power to produce, or producing, a desired result. These new teaching methods have proved very effective.
2. striking or pleasing. an effective display of flowers.
3. in operation; working; active. The new law becomes effective next week.
efˈfectively (-tivli) adverb
efˈfects noun plural
1. property; goods. She left few personal effects when she died.
2. in drama etc, devices for producing suitable sounds, lighting etc to accompany a play etc. sound effects.
efˈfectual (-tʃuəl) adjective
successful in producing the desired results. He was not very effectual as an organiser.
come into effect
(of a law etc) to begin to operate. The law came into effect last month.
for effect
for the sake of making an impression. You don't mean that – you only said it for effect.
in effect
1. (of a rule etc) in operation. That law is no longer in effect.
2. in truth or in practical terms. In effect our opinions differed very little.
put into effect
to put (a law etc) into operation. He has begun to put his theories into effect.
take effect
to begin to work; to come into force. When will the drug take effect?


فَعَّال účinný effektiv wirksam αποτελεσματικός eficaz tehokas effectif učinkovit efficace 効果的な 효과적인 effectief effektiv skuteczny eficaz действенный effektiv ได้ผลดี etkili hiệu quả 有效的


adj eficaz, efectivo; (clinical research) eficaz bajo condiciones normales (See note under efficacy.)
References in periodicals archive ?
We expect the dividend payout to be broadly neutral for FCF as it is mitigated by a reduction of about RUB2 billion in effective interest rates as a result of the recent debt refinancing, on top of other operational optimisation cost savings of over RUB1 billion delivered in 1H17.
The savings in interest margin from refinancing arrangement has lowered effective interest rate to 1.
After computing the effective interest rate to a sufficient number of significant digits, one can then develop an accurate amortization table.
The Extended Fund Facility (EFF) with a repayment period of up to 10 years would carry an effective interest rate of 9 percent.
The increase in the yield curve level during Q4 resulted in an increase in the effective interest rate and, consequently, decreased the model pension plan's liability by two percent.
That has translated into a 1 percent effective interest rate for the banks.
Instead of introduction of restrictions for interest rates, the regulatory framework should mandate submission of the information on annual effective interest rate and full cost of the micro-loan for microfinance organizations.
That's what the effective interest rate calculation assumes, but not how it is in real life.
The bonds were marketed as having an effective interest rate of 27 percent because the interest is not taxable.
This is because banks just quote the rack rates, whereas the effective interest rate is much lower and it varies from dealer to dealer.
34 for 80 percent loan-to-value ratio loans, meaning the effective interest rate decreased week-over-week.

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