1
[ adjective ] marked by qualities giving the power to produce an intended effect

Examples

"written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley "the medicine is efficacious in stopping a cough"

Used in print

(John F. Hayward, "Mimesis and Symbol in the Arts"...)

These desires presuppose a sense of causally efficacious powers in which one is involved , some working for one 's good , others threatening ill .

2
[ adjective ] producing or capable of producing an intended result or having a striking effect

Synonyms

effective effectual

Examples

"an air-cooled motor was more effective than a witch's broomstick for rapid transportation"-LewisMumford "effective teaching methods" "effective steps toward peace"

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