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.

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..

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

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..

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

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

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

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

Coefficacy :: Coefficacy (n.) Joint efficacy.

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

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

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

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

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

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

Vain :: Vain (superl.) Destitute of forge or efficacy; effecting no purpose; fruitless; ineffectual; as, vain toil; a vain attempt..

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

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..

Virtuate :: Virtuate (v. t.) To make efficacious; to give virtue of 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.

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