English to English Dictionary -efficacy

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Coefficacy :: Coefficacy (n.) Joint efficacy.

Efficacious :: Efficacious (n.) Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law..

Efficacity :: Efficacity (n.) Efficacy.

Efficacy :: Efficacy (n.) Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer..

Inefficacious :: Inefficacious (a.) Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent.

Inefficaciously :: Inefficaciously (adv.) without efficacy or effect.

Inefficaciousness :: Inefficaciousness (n.) Want of effect, or of power to produce the effect; inefficacy..

Inefficacy :: Inefficacy (n.) Want of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means..