idea

noun

1. 1

   an approximate calculation of quantity or degree or worth

   an estimate of what it would cost

   a rough idea how long it would take

2. 2

   the content of cognition; the main thing you are thinking about

   it was not a good idea

   the thought never entered my mind

3. 3

   a personal view

   he has an idea that we don't like him

4. 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. 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