Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of efficacy is as below...

Available :: Available (a.) Having sufficient power, force, or efficacy, for the object; effectual; valid; as, an available plea..

Ineffectualness :: Ineffectualness (n.) Want of effect, or of power to produce it; inefficacy..

Efficacity :: Efficacity (n.) Efficacy.

Nullify :: Nullify (a.) To make void; to render invalid; to deprive of legal force or efficacy.

Magistery :: Magistery (n.) Mastery; powerful medical influence; renowned efficacy; a sovereign remedy.

Inefficiency :: Inefficiency (n.) The quality of being inefficient; want of power or energy sufficient; want of power or energy sufficient for the desired effect; inefficacy; incapacity; as, he was discharged from his position for inefficiency..

Infringe :: Infringe (v. t.) To hinder; to destroy; as, to infringe efficacy; to infringe delight or power..

Charm :: Charm (n.) Anything worn for its supposed efficacy to the wearer in averting ill or securing good fortune.

Quacksalver :: Quacksalver (n.) One who boasts of his skill in medicines and salves, or of the efficacy of his prescriptions; a charlatan; a quack; a mountebank..

Sacramentarian :: Sacramentarian (n.) One who holds extreme opinions regarding the efficacy of sacraments.

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

Degradation :: Degradation (n.) Diminution or reduction of strength, efficacy, or value; degeneration; deterioration..

Unsacrament :: Unsacrament (v. t.) To deprive of sacramental character or efficacy; as, to unsacrament the rite of baptism..

Invalidity :: Invalidity (n.) Want of validity or cogency; want of legal force or efficacy; invalidness; as, the invalidity of an agreement or of a will..

Prevalent :: Prevalent (a.) Gaining advantage or superiority; having superior force, influence, or efficacy; prevailing; predominant; successful; victorious..

Virtual :: Virtual (a.) Having the power of acting or of invisible efficacy without the agency of the material or sensible part; potential; energizing.

Fleabane :: Fleabane (n.) One of various plants, supposed to have efficacy in driving away fleas. They belong, for the most part, to the genera Conyza, Erigeron, and Pulicaria..

Weight :: Weight (v. t.) Importance; power; influence; efficacy; consequence; moment; impressiveness; as, a consideration of vast weight..

Coefficacy :: Coefficacy (n.) Joint efficacy.

Prevailment :: Prevailment (n.) Prevalence; superior influence; efficacy.

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