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say it: ef-uh-KAY-shuhs
efficacious is an adjective meaning "marked by qualities giving the power to produce an intended effect". It carries 2 recorded senses.
marked by qualities giving the power to produce an intended effect
“written propaganda is less efficacious than the habits and prejudices...of the readers”
“the medicine is efficacious in stopping a cough”
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”
“effective teaching methods”
“effective steps toward peace”
“made an effective entrance”
“his complaint proved to be effectual in bringing action”
“an efficacious law”
Definitions, synonyms and semantic relations for efficacious come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.