"it was not a good idea""the thought never entered my mind"
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"
a personal view;"he has an idea that we don't like him"
an approximate calculation of quantity or degree or worth;"an estimate of what it would cost""a rough idea how long it would take"
(music) melodic subject of a musical composition;"the theme is announced in the first measures""the accompanist picked up the idea and elaborated it"