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Definitions

idea

[ahy-dee-uh, ahy-deeuh] / aɪˈdi ə, aɪˈdiə /
NOUN
a conception or thought.
Synonyms
STRONGEST
belief concept conception conclusion design feeling form intention interpretation meaning notion objective opinion perception plan scheme sense solution suggestion theory thought understanding view
STRONG
aim approximation brainstorm clue conviction doctrine essence estimate fancy flash guess hint hypothesis import impression inkling intimation judgment object pattern purpose reason significance suspicion teaching viewpoint
Antonyms
STRONGEST
reality thing
STRONG
insignificance measurement truth

Usage

What are other ways to say idea? The noun idea, although it may refer to thoughts of any degree of seriousness or triviality, is commonly used for mental concepts considered more important or elaborate: We pondered the idea of the fourth dimension. The idea of his arrival frightened me. Thought, which reflects its primary emphasis on the mental process, may denote any concept except the more weighty and elaborate ones: I welcomed his thoughts on the subject. A thought came to him. Conception suggests a thought that seems complete, individual, recent, or somewhat intricate: The architect's conception delighted them. Notion suggests a fleeting, vague, or imperfect thought: a bare notion of how to proceed.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Due to mainstream media coverage, he argued, “an idea can become potent through its rapid depiction in culture—including in articles such as this one, which maxes maxxing even as it attempts to minimize it, somewhat.”

From Salon • Apr. 6, 2026

The idea for Campus Guardian Angel came from Justin Marston, a British entrepreneur and Mithril co-founder, who saw videos of small Ukrainian drones pestering Russian soldiers with guns.

From The Wall Street Journal • Apr. 5, 2026

It’s the idea that anyone, even someone with no coding background, can use A.I. tools like Claude Code to program for them.

From Slate • Apr. 5, 2026

"It was in the foundry for three to six months; they suggested rotating it and I thought what a brilliant idea."

From BBC • Apr. 5, 2026

Thus, the idea that this unwelcome stranger would bring mayhem to their delicate balance was detestable.

From "The Undead Fox of Deadwood Forest" by Aubrey Hartman

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.