idea
n//aɪˈdi.ə//idé, tanke
An image of an object that is formed in the mind or recalled by the memory. [from 16th c.]
More generally, any result of mental activity; a thought, a notion; a way of thinking. [from 17th c.]
A conception in the mind of something to be done; a plan for doing something, an intention. [from 17th c.]