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efficacious

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efficacious/ˌɛfəˈkeɪʃəs/adjective
efficacious
/ˌɛfəˈkeɪʃəs/
adjective
Learner's definition of EFFICACIOUS  
[more efficacious; most efficacious]formal
: having the power to produce a desired result or effect : effective

— efficaciously

adverb

— efficaciousness

noun,[noncount]
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