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...

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

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..

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

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

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.

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

Insignificance :: Insignificance (n.) Want of force or effect; unimportance; pettiness; inefficacy; as, the insignificance of human art..

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

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

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

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..

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

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..

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

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

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

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

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