idea
n. countable A1 Beginner Oxford US //aɪˈdiə// UK //aɪdˈiə// idea
n. a thought, plan, or suggestion about what to do. It is what you have in your mind when you think of something new.
n. a mental representation, concept, or plan formed by the mind. Often used to refer to a specific suggestion or a general understanding of a subject.
I have a great idea for a new game.
The team met for an hour to share every idea they had for the upcoming marketing campaign.
The philosopher explored the idea that true justice cannot exist without complete transparency in government.
Usage
Often followed by the preposition 'for' or 'of', or by a 'that' clause.
Pitfall
I have no idea about where he is.I have no idea where he is.The phrase 'have no idea' is usually followed directly by a question word (where, what, why) without a preposition.