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Efficacious

//ˌɛf.ɪˈkeɪ.ʃəs// adj

Definitions

Adjective
  1. 1
    Effective; possessing efficacy. formal

    "This medicine is efficacious."

Adjective
  1. 1
    producing or capable of producing an intended result or having a striking effect wordnet
  2. 2
    marked by qualities giving the power to produce an intended effect wordnet

Etymology

From Old French efficacieux, from Latin efficāx (“efficacious”) + -ous, from efficere (“to effect, to accomplish”); see effect.

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