Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “idea”

See all translations

idea

noun  /ɑɪˈdi·ə/ us  

idea noun (SUGGESTION)

[C] a suggestion, thought, or plan: "Let’s go swimming." "Good idea!" She’s full of bright ideas.

idea noun (KNOWLEDGE)

[C/U] knowledge or understanding about something: [C] Can you give me a rough idea of the cost (= tell me approximately how much it will cost)? [U] You have no idea what I just said, do you?

idea noun (BELIEF)

[C] a belief about something: They have some unusual ideas about parenting.

idea noun (PURPOSE)

[C usually sing] a purpose or reason for doing something: The idea behind the law is to raise money for education.
(Definition of idea from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of idea?
Add Cambridge dictionaries to your browser to your website

Definitions of “idea” in other dictionaries

Word of the Day

make believe

believing or imagining things that appear to be attractive or exciting, but are not real

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

showrooming noun

February 23, 2015
the activity of examining a product in a physical store and then making the purchase with an online retailer Amazon’s new smartphone is specifically designed to make showrooming fast and easy.

Read More