English Meaning & Definitions
The ability to produce a desired or intended result; effectiveness.
- “The committee is studying the efficacy of the new drug in treating chronic pain.”
- “There is little evidence to support the efficacy of these traditional herbal remedies.”
English Synonyms & Near Equivalents
English Antonyms & Opposites
Comprehensive Thesaurus Breakdown
Compare formal, informal, literary synonyms and register nuances for “efficacy”.
Derived from the Latin 'efficacia', which comes from 'efficere' (to accomplish or bring about). It is composed of 'ex-' (out) and 'facere' (to do/make). The word entered Middle English in the 15th century, retaining its core meaning of the power to produce a desired effect.
Think of 'EFFICient ACtivity': If something has efficacy, it is efficient at producing the desired activity or result.
Frequently Asked Questions About “efficacy”
1. What is the meaning of “efficacy” in English?
In English, efficacy (noun) is defined as: “The ability to produce a desired or intended result; effectiveness.”.
2. How do you use “efficacy” in a sentence?
“The committee is studying the efficacy of the new drug in treating chronic pain.”
3. What are English synonyms of “efficacy”?
4. What is the etymology and word origin of “efficacy”?
Derived from the Latin 'efficacia', which comes from 'efficere' (to accomplish or bring about). It is composed of 'ex-' (out) and 'facere' (to do/make). The word entered Middle English in the 15th century, retaining its core meaning of the power to produce a desired effect.
🇬🇧More English Words to English
View all English words →A measurement of time indicating an instantaneous occurrence or a state where no time has elapsed.
The base unit of time in the International System of Units (SI), equal to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom.
A specific duration of time equal to one hour and forty-six minutes and twelve seconds.
The cardinal number equal to one thousand million (1,000,000,000), expressed in scientific notation as 10^9.