n. 25B6; noun
he had a notion that something was wrong : IDEA, belief, conviction, opinion, view, thought, impression, perception; hypothesis, theory; (funny) feeling, (sneaking) suspicion, hunch.
Claire had no notion of what he meant : UNDERSTANDING, idea, awareness, knowledge, clue, inkling.
he got a notion to return : IMPULSE, inclination, whim, desire, wish, fancy.