What does idea mean?
An idea is a thought, concept, or suggestion that exists in the mind. Depending on context, it may refer to an abstract notion, a proposed plan or solution, an opinion about something, or a general understanding of a situation. “I have an idea” usually introduces a suggestion or possible course of action, whereas “I understand the idea” refers to comprehension. The word is common in everyday conversation as well as in academic, professional, and creative writing. Its flexibility allows it to describe anything from a fleeting thought to a carefully developed concept, but in informal use “that’s a good idea” often means only that a proposal seems promising, not that it has been fully evaluated. Idea is also used figuratively in expressions such as “the idea of the thing,” where it means the essential purpose or basic concept.
nounA thought, concept, or suggestion formed in the mind. It can also refer to a plan, an opinion, or an understanding of a situation.
- A thought, concept, or notion.
- A plan, suggestion, or proposal for action.
- An opinion, belief, or impression.
- An understanding or conception of a situation.
"I had an idea for making the task easier."
"The idea came to her while she was taking a walk."
"What is your idea of a balanced and enjoyable life?"
The regular plural of the countable noun is “ideas.” In phrases such as “What is the idea?” it normally remains singular.
"The students shared their ideas for the project."
The word that means a thought began life as Greek for a form or pattern.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does idea come from?
Idea entered English in the late 16th century from the Latin idea, a learned borrowing of the Greek ἰδέα, meaning “form,” “appearance,” or “pattern.” Greek ἰδέα was derived from εἶδος, “form” or “appearance.” The word originally emphasized the form or appearance perceived by the mind and gradually developed its modern sense of a thought, concept, or notion.
Related word forms
How idea is actually used
The word is highly common in both formal and informal English. In informal contexts, it can suggest a preliminary notion rather than a fully developed plan.
Easily confused with idea
An idea is a thought or suggestion, whereas an ideal is a perfect or highly desirable standard.