1. a thought or suggestion about a possible course of action
2. a concept or mental impression
3. an opinion or belief

Examples

• I have an idea for our school project.
• The idea of traveling alone made her nervous.
• What’s your idea about the new policy?
• I had no idea you were coming today.
• The whole idea is to help students learn better.
• That’s a brilliant idea!
• She got the idea from a magazine article.