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.

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

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

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..

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

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.

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..

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

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

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..

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..

Stand :: Stand (n.) To be or remain as it is; to continue in force; to have efficacy or validity; to abide.

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

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

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

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

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

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

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

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

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