NOTION

[noun] - (a) belief or ideaThe programme makers reject the notion that seeing violence on television has a harmful effect on children. [C + that clause]I have only a vague notion of what she does for a living. [C]Have you any notion how much it costs to keep a dog? [U + wh- word]However did you get such a notion (= silly idea)? [C](dated) If you have/take a notion to do something, you suddenly want to do it.I had a notion to write them a letter.