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...

Virtuous :: Virtuous (a.) Having power or efficacy; powerfully operative; efficacious; potent.

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

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

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

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

Avail :: Avail (v. i.) To be of use or advantage; to answer the purpose; to have strength, force, or efficacy sufficient to accomplish the object; as, the plea in bar must avail, that is, be sufficient to defeat the suit; this scheme will not avail; medicines will not avail to check the disease..

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..

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

Potentness :: Potentness (n.) The quality or state of being potent; powerfulness; potency; efficacy.

Coefficacy :: Coefficacy (n.) Joint efficacy.

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.

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

Force :: Force (n.) Validity; efficacy.

Efficacity :: Efficacity (n.) Efficacy.

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

Virtually :: Virtually (adv.) In a virtual manner; in efficacy or effect only, and not actually; to all intents and purposes; practically..

Availableness :: Availableness (n.) Competent power; validity; efficacy; as, the availableness of a title..

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..

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

Null :: Null (a.) Of no legal or binding force or validity; of no efficacy; invalid; void; nugatory; useless.

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