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...

Virtuality :: Virtuality (n.) Potentiality; efficacy; potential existence.

Efficacity :: Efficacity (n.) Efficacy.

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

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..

Nullity :: Nullity (n.) The quality or state of being null; nothingness; want of efficacy or force.

Virtueless :: Virtueless (a.) Destitute of virtue; without efficacy or operating qualities; powerless.

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..

Invalid :: Invalid (a.) Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement..

Potency :: Potency (n.) The quality or state of being potent; physical or moral power; inherent strength; energy; ability to effect a purpose; capability; efficacy; influence.

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

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

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.

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

Virtue :: Virtue (n.) Active quality or power; capacity or power adequate to the production of a given effect; energy; strength; potency; efficacy; as, the virtue of a medicine..

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..

Vigor :: Vigor (n.) Strength; efficacy; potency.

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

Coefficacy :: Coefficacy (n.) Joint efficacy.

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

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