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...

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

Strong :: Strong (superl.) Having virtues of great efficacy; or, having a particular quality in a great degree; as, a strong powder or tincture; a strong decoction; strong tea or coffee..

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

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.

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..

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

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

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

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

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..

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

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

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

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

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

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..

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

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