Noun
1. the content of cognition; the main thing you are thinking about;
"it was not a good idea""the thought never entered my mind"2. a personal view;
"he has an idea that we don't like him"3. an approximate calculation of quantity or degree or worth;
"an estimate of what it would cost""a rough idea how long it would take"4. 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"5. (music) melodic subject of a musical composition;
"the theme is announced in the first measures""the accompanist picked up the idea and elaborated it"