What does the word idea mean?

Usage examples for idea

  1. Have you any idea what 'Stumpage John' is goin' to do with the other one- the left- hand one? – King Spruce, A Novel by Holman Day
  2. Of course I didn't have any idea you'd come waltzin' along this way. – McAllister and His Double by Arthur Train
  3. I've had no idea that Peachy would ever get over it. – Angel Island by Inez Haynes Gillmore