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efficacy

noun

/ˈɛf.ɪ.kə.si/

Meaning

The ability to produce a desired or intended result; effectiveness.

The ability to produce a desired or intended result.

The efficacy of the vaccine has been proven in trials.

The efficacy of the new vaccine has been proven.

The efficacy of the vaccine has been proven in trials.

effectiveness, efficiency, success, potency

Entry 1

effectiveness, efficiency, success

Entry 2

effectiveness, potency

Entry 3

effectiveness, efficiency, success

inefficacy, failure, uselessness, ineffectiveness

Entry 1

inefficacy, failure, uselessness

Entry 2

ineffectiveness, failure

Entry 3

inefficacy, failure, uselessness

a natural tendency or inclination to behave in a particular way

The surroundings or conditions in which a person, animal, or plant lives or operates.

a particular area or part of a country or the world

The capacity to recover quickly from difficulties; toughness.

Difficulties; misfortune.

The state of existing in reality rather than in appearance or imagination.