Meaning & Definition of word "Efficacy"

Efficacy

/ˈɛfɪkəsi/

noun:

  • 1. The ability to produce a desired or intended result.
    • Example: The efficacy of the new vaccine was demonstrated in clinical trials.
  • 2. Effectiveness; the capacity to produce a desired effect.
    • Example: Researchers are studying the efficacy of various treatments for the disease.
  • 3. The power to produce an effect.
    • Example: The efficacy of the advertising campaign was reflected in the increased sales.
  • 4. The degree to which something is successful in producing a desired result.
    • Example: There are concerns about the long-term efficacy of the drug.
  • 5. Success in achieving the intended outcome.
    • Example: The efficacy of meditation in reducing stress has been well-documented.

Etymology

Late Latin 'efficacia', from 'efficax' meaning 'effective'.

Common Phrases and Expressions

efficacy of a treatment:

The ability of a treatment to provide the intended health benefit.

efficacy research:

Studies conducted to evaluate the effectiveness of treatments or interventions.

demonstrate efficacy:

To show that something is able to produce the desired effect.

Related Words

effective:

Having the desired outcome.

efficiency:

The ability to accomplish something with the least waste of time and effort.

effect:

A change that is a result or consequence of an action.

Slang Meanings of efficacy

Meaning: Do the job

Example Sentence: That new app really does the job when it comes to improving productivity.

Meaning: Hits the mark

Example Sentence: The new marketing strategy hits the mark in attracting a younger audience.