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...

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

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

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..

Sacramentarian :: Sacramentarian (n.) One who holds extreme opinions regarding the efficacy of sacraments.

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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