1. (noun)idea, thought the content of cognition; the main thing you are thinking about
"it was not a good idea"; "the thought never entered my mind"
2. (noun)mind, idea your intention; what you intend to do
"he had in mind to see his old teacher"; "the idea of the game is to capture all the pieces"
3. (noun)idea a personal view
"he has an idea that we don't like him"
4. (noun)estimate, estimation, approximation, idea an approximate calculation of quantity or degree or worth
"an estimate of what it would cost"; "a rough idea how long it would take"
5. (noun)theme, melodic theme, musical theme, idea (music) melodic subject of a musical composition
"the theme is announced in the first measures"; "the accompanist picked up the idea and elaborated it"