Word Games Pro Dictionary

efficacy

noun

Capacity or power to produce a desired effect

Quick reference

Word Facts

Word length
8
Starts with
E
Ends with
Y
Contains
FF
Scrabble score
21
CEFR level
B2

How it sounds

Pronunciation

ˈɛf.ɪ.kə.si

Listen

Audio Pronunciation

Meaning

Definitions

noun

  1. Capacity or power to produce a desired effect

    “Concern about the safety and efficacy of the vaccine”

In context

Example Sentences

Concern about the safety and efficacy of the vaccine

Similar words

Synonyms

Opposite words

Antonyms

Check yourself

Practise This Word

Three quick questions on this word. Nothing is recorded — practise it as often as you like.

Scroll to Top