a thought or suggestion as to a possible course of action, a concept or mental impression

throw ideas around, the idea of a lifetime, not have the foggiest idea

get the wrong idea, the very idea, have no idea

Formal and Informal Expressions of idea

In different contexts, you can replace 'idea' with suitable alternatives. In a more formal setting, 'concept, notion' is apt. In informal speech or writing, 'thought, brainwave' is a commonplace synonym.

idea: Explore its Definition & Usage

idea Definition

1a thought or suggestion as to a possible course of action
2a concept or mental impression

Using idea: Examples

Take a moment to familiarize yourself with how "idea" can be used in various situations through the following examples!

Example
I have an idea for a new business.
Example
She had no idea what he was talking about.
Example
The idea of going back to school terrifies me.
Example
The idea of traveling the world is very appealing.

idea Synonyms and Antonyms

Synonyms for idea

Antonyms for idea

Idioms Using idea

throw ideas around
to suggest different ideas and discuss them informally
Example
We were just throwing ideas around, trying to come up with a plan.
the idea of a lifetime
an opportunity or idea that is considered to be the best or most important one that someone will ever have
Example
When she heard about the job offer, she knew it was the idea of a lifetime.
not have the foggiest idea
to not have any understanding or knowledge of something
Example
I don't have the foggiest idea what you're talking about.

Phrases with idea

get the wrong idea
to misunderstand something, often in a way that causes problems or offense
Example
I think you got the wrong idea about what I meant.
the very idea
used to express shock, disbelief, or disapproval about something
Example
The very idea of leaving my child alone in the house all night is terrifying.
have no idea
to not know or have any understanding of something
Example
I have no idea how to fix this problem.

Origins of idea

from Greek 'idein', meaning 'to see'

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Summary: idea in Brief

The term 'idea' [aɪˈdiə] refers to a thought or suggestion as to a possible course of action, or a concept or mental impression. It spans contexts from business plans to travel aspirations, exemplified by 'I have an idea for a new business.' 'Idea' extends into phrases like 'get the wrong idea,' and idioms like 'throw ideas around,' denoting informal discussions, and 'the idea of a lifetime,' implying a unique opportunity.