efficacious

The definition of efficacious is someone or something that successfully produced a result that was desired.

(adjective)

An example of efficacious is a program that was designed to help stop crime and that reduced the crime rate by 80 percent.

See efficacious in Webster's New World College Dictionary

adjective

producing or capable of producing the desired effect; having the intended result; effective: an efficacious drug

Origin: L efficax (gen. efficacis) < efficere, to bring to pass, accomplish (see effect) + -ous

Related Forms:

See efficacious in American Heritage Dictionary 4

adjective

Producing or capable of producing a desired effect. See Synonyms at effective.

Origin:

Origin: From Latin efficāx, efficāc-

Origin: , from efficere, to effect; see effect

Related Forms:

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