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efficacious

adjective

  1. (marked, qualities giving)  marked by qualities giving the power to produce an intended effect
    Similar to: effective. Described by: efficacy
  2. (effectual)  producing or capable of producing an intended result or having a striking effect
    Synonyms: effective, effectual. Similar to: hard-hitting, impelling, impressive, rough-and-ready...

Etymology summary

"sure to have the desired effect" (often of medicines), from Latin efficaci-,...
(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:

efficacious | efficaciously [adverb, derived]

capable of or successful in producing an intended result; effective as a means, remedy, etc (15 of 399 words, 5 usage examples, pronunciation)

www​.collinsdictionary​.com​/dictionary​/english​/efficacious

Merriam-Webster:

efficacious | effectual [synonym] | effective [synonym] | efficient [synonym] | fruitful [synonym] | operative [synonym] | potent [synonym] | productive [synonym] | efficaciously [adverb, related] | ...

having the power to produce a desired effect (8 of 153 words, 2 usage examples, pronunciation)

www​.merriam-webster​.com​/dictionary​/efficacious

Oxford Dictionary:

efficacious | effective [synonym, sense-specific] | efficaciously [derived] | efficaciousness [derived]

Syllabification: (ef·fi·ca·cious) | [formal] | (typically of something inanimate or abstract) successful in producing a desired or intended result; ... (17 of 65 words, 3 definitions, 1 usage example, pronunciation)

oxforddictionaries​.com​/definition​/american english​/efficacious

efficacious [formal] | effective [synonym] | efficaciously [derived] | efficaciousness [derived]

(of something inanimate or abstract) successful in producing a desired or intended result; effective (14 of 60 words, 1 usage example, pronunciation)

oxforddictionaries​.com​/definition​/english​/efficacious

New World Dictionary:

efficacious | efficaciously [adverb, related] | efficaciousness [noun, related]

producing or capable of producing the desired effect; having the intended result; effective (13 of 37 words, 1 usage example, pronunciation)

www​.yourdictionary​.com​/efficacious

American Heritage Dictionary:

efficacious | efficaciously [adverb, related] | efficaciousness [noun, related]

Producing or capable of producing a desired effect. (8 of 31 words, pronunciation)

www​.yourdictionary​.com​/efficacious

Macmillan British Dictionary:

efficacious [formal]

producing the effect that you intended (6 of 30 words, pronunciation)

www​.macmillandictionary​.com​/dictionary​/british​/efficacious

Wiktionary:

effective

Having the power to produce a required effect or effects. | Producing a decided or decisive effect. | Efficient, serviceable, or operative, available for useful work. | Actually in effect. (27 of 29 words, 4 definitions, 7 usage examples, pronunciation)

en​.wiktionary​.org​/wiki​/effective

Random House Dictionary:

efficacious

capable of having the desired result or effect; effective as a means, measure, remedy, etc.. (15 of 28 words, 1 usage example, pronunciation)

dictionary​.infoplease​.com​/efficacious

Cambridge Dictionary:

efficacious [formal]

able to produce the intended result; effective (7 of 12 words, pronunciation)

dictionary​.cambridge​.org​/dictionary​/british​/efficacious

Encarta Dictionary:

efficacious [formal]

having the power to produce a desired result, especially an improvement (11 of 44 words, pronunciation)

encarta​.msn​.com​/dictionary 1861607598​/definition​.html  [offline]

Etymology references

Online Etymology:

efficacious

First use: 1520s

Origin: "sure to have the desired effect" (often of medicines), from Latin efficaci-, stem of efficax + "-ous".

www​.etymonline​.com​/index​.php term=efficacious

Wiktionary:

efficacious

Origin: Old French efficacieux, from Latin efficax ("efficacious"), from efficere ("to effect, accomplish, to"); see effect.

en​.wiktionary​.org​/wiki​/efficacious

New World Dictionary:

efficacious

Origin: Latin efficax (generally efficacis) from efficere, to bring to pass, accomplish (see "effect") + "-ous"

www​.yourdictionary​.com​/efficacious

Collins Dictionary:

efficacious

First use: 16th century

Origin: from Latin efficāx powerful, efficient, from efficere to achieve; see effect

www​.collinsdictionary​.com​/dictionary​/english​/efficacious

Oxford Dictionary:

efficacious

First use: early 16th century

Origin: Latin efficax, efficac- (from efficere "accomplish": see "effect") + "-ious"

oxforddictionaries​.com​/definition​/american english​/efficacious

American Heritage Dictionary:

efficacious

Origin: From Latin efficāx, efficāc-, from efficere, to effect; see "effect".

www​.yourdictionary​.com​/efficacious

Merriam-Webster:

efficacious

First use: 1528

Origin: Latin efficac-, efficax, from efficere

www​.merriam-webster​.com​/dictionary​/efficacious

Encarta Dictionary:

efficacious [formal]

First use: Early 16th century

Origin: Latin efficac- from efficere

encarta​.msn​.com​/dictionary 1861607598​/definition​.html  [offline]

Audio references

Collins Dictionary:

efficacious

Audio: North American English pronunciation of "efficacious"

www​.collinsdictionary​.com​/dictionary​/english​/efficacious

Macmillan American Dictionary:

efficacious [formal]

Audio: North American pronunciation of "efficacious"

www​.macmillandictionary​.com​/dictionary​/american​/efficacious

Macmillan British Dictionary:

efficacious [formal]

Audio: British English pronunciation of "efficacious"

www​.macmillandictionary​.com​/dictionary​/british​/efficacious

Cambridge Dictionary:

efficacious [formal]

Audio 1: British English pronunuciation of "efficacious"

Audio 2: North American English pronunuciation of "efficacious"

dictionary​.cambridge​.org​/dictionary​/british​/efficacious

the Free Dictionary:

efficacious

Audio 1: North American English pronunciation of "efficacious"

Audio 2: British English pronunciation of "efficacious"

Audio 3: North American English pronunciation of "efficacious" by speech synthesizer

www​.thefreedictionary​.com​/efficacious

Google Dictionary:

efficacious

Audio: English pronunciation of "efficacious"

www​.google​.com​/#hl=en&tbs=dfn​:1&fp=1&q=efficacious

Merriam-Webster Pronunciation:

efficacious

Audio: North American pronunciation of "efficacious"

www​.merriam-webster​.com​/audio​.php file=effica​01 word=efficacious

YourDictionary Audio:

efficacious

Audio: North American English pronunciation of "efficacious" by speech synthesizer

www​.yourdictionary​.com​/efficacious

Page last updated: 2013-06-26

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