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