"notion" in the noun sense
1. impression, feeling, belief, notion, opinion
a vague idea in which some confidence is placed
"his impression of her was favorable"
"what are your feelings about the crisis?"
"it strengthened my belief in his sincerity"
"I had a feeling that she was lying"
a general inclusive concept
3. notion, whim, whimsy, whimsey
an odd or fanciful or capricious idea
"the theatrical notion of disguise is associated with disaster in his stories"
"he had a whimsy about flying to the moon"
"whimsy can be humorous to someone with time to enjoy it"
usually plural) small personal articles or clothing or sewing items
"buttons and needles are notions"
Source: WordNet® (An amazing lexical database of English)
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