1 a a concept or idea; a conception (it was an absurd notion). b an opinion (has the notion that people are honest). c a vague view or understanding (have no notion what you mean).
2 an inclination, impulse, or intention (has no notion of conforming).
3 (in pl.) small, useful articles, esp. haberdashery.
Etymology: L notio idea f. notus past part. of noscere know
Useful english dictionary. 2012.