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efficacy
Definition:

capacity or power to produce a desired effect
Class:

attribute noun (attributes of people and objects)
Related to:

efficacious
Plural:

efficacies
Type of:

effectiveness » powerfulness » quality » attribute
Describes:

efficacious | inefficacious
Original source:

Princeton WordNet
Usage example:

concern about the safety and efficacy of the vaccine
Synonyms:

efficaciousness | efficacity
Etymology:

Latin efficacia "efficacy, efficiency", from efficax (genitive efficacis)...
(Source: Online Etymology)  [more]
Definition references
Wikipedia:
Efficacy

the capacity to produce an effect. It has different specific meanings in different fields. In medicine, it's the ability of an intervention or drug to produce a desired effect. In medicine, efficacy indicates the capacity for beneficial change of a... (40 of 1053 words)

en​.wikipedia​.org​/wiki​/Efficacy
Collins Dictionary:
efficacy | effectiveness [synonym]

the quality of being successful in producing an intended result; effectiveness (11 of 503 words, 9 usage examples, pronunciation)

www​.collinsdictionary​.com​/dictionary​/english​/efficacy
Merriam-Webster:
efficacy | efficacies [plural] | edge [synonym] | effectiveness [synonym] | effectualness [synonym] | efficaciousness [synonym] | efficacity [synonym] | efficiency [synonym] | productiveness [synonym]

the power to produce an effect (6 of 144 words, 1 usage example, pronunciation)

www​.merriam-webster​.com​/dictionary​/efficacy
Oxford Dictionary:
efficacy [formal]

the ability to produce a desired or intended result (9 of 53 words, 1 usage example, pronunciation)

oxforddictionaries​.com​/definition​/english​/efficacy
efficacy

Syllabification: (ef¡¤fi¡¤ca¡¤cy) | the ability to produce a desired or intended result (11 of 53 words, 2 definitions, 1 usage example, pronunciation)

oxforddictionaries​.com​/definition​/american english​/efficacy
Macmillan British Dictionary:
efficacy [uncountable, formal]

effectiveness in producing the result that you intended (8 of 42 words, 1 usage example, pronunciation)

www​.macmillandictionary​.com​/dictionary​/british​/efficacy
Cambridge Dictionary:
efficacy [formal]

an ability, especially of a medicine or a method of achieving something, to produce the intended result; effectiveness (18 of 37 words, 1 usage example, pronunciation)

dictionary​.cambridge​.org​/dictionary​/british​/efficacy
New World Dictionary:
efficacy

power to produce effects or intended results; effectiveness (8 of 24 words, pronunciation)

www​.yourdictionary​.com​/efficacy
American Heritage Dictionary:
efficacy

Power or capacity to produce a desired effect; effectiveness. (9 of 22 words, pronunciation)

www​.yourdictionary​.com​/efficacy
Random House Dictionary:
efficacy | efficacies [plural] | efficacity | efficacities [plural]

capacity for producing a desired result or effect; effectiveness. (9 of 21 words, 1 usage example, pronunciation)

dictionary​.infoplease​.com​/efficacy
Wiktionary:
efficacy [uncountable] | efficacity [synonym] | efficacies [plural] | efficacities [plural]

Ability to produce a desired amount of a desired effect. (10 of 17 words, pronunciation)

en​.wiktionary​.org​/wiki​/efficacy
Encarta Dictionary:
efficacy | efficacity

the ability to produce the desired result (7 of 30 words, pronunciations)

encarta​.msn​.com​/dictionary 1861607599​/definition​.html  [offline]
Etymology references
Online Etymology:
efficacy

First use: 1520s

Origin: Latin efficacia "efficacy, efficiency", from efficax (genitive efficacis) "powerful, effective", from stem of efficere ... (15 of 43 etymology words)

www​.etymonline​.com​/index​.php term=efficacy
New World Dictionary:
efficacy

Origin: Middle English and Old French efficace from Latin efficacia from efficax: see "efficacious"

www​.yourdictionary​.com​/efficacy
Oxford Dictionary:
efficacy [formal]

First use: early 16th century

Origin: Latin efficacia, from efficax, efficac- (see "efficacious"

oxforddictionaries​.com​/definition​/english​/efficacy
American Heritage Dictionary:
efficacy

Origin: Latin effic¨¡cia, from effic¨¡x, effic¨¡c-, efficacious; see "efficacious".

www​.yourdictionary​.com​/efficacy
Wiktionary:
efficacy [uncountable]

Origin: Latin efficacia ("efficacy", from efficax ("efficacious"; see efficacious.

en​.wiktionary​.org​/wiki​/efficacy
Merriam-Webster:
efficacy

First use: 1528

Origin: Latin efficac-, efficax, from efficere

www​.merriam-webster​.com​/dictionary​/efficacy
Encarta Dictionary:
efficacy

First use: Early 16th century

Origin: Latin efficacia from efficac-

encarta​.msn​.com​/dictionary 1861607599​/definition​.html  [offline]
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