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...

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..

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.

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

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

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..

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

Inefficiency :: Inefficiency (n.) The quality of being inefficient; want of power or energy sufficient; want of power or energy sufficient for the desired effect; inefficacy; incapacity; as, he was discharged from his position for inefficiency..

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

Inefficaciously :: Inefficaciously (adv.) without efficacy or effect.

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

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

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

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

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

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

Coefficacy :: Coefficacy (n.) Joint efficacy.

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..

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

Infringe :: Infringe (v. t.) To hinder; to destroy; as, to infringe efficacy; to infringe delight or power..

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

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