Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun notion

4 senses of notion

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")
       => idea, thought -- (the content of cognition; the main thing you are thinking about; "it was not a good idea"; "the thought never entered my mind")

Sense 2
notion -- (a general inclusive concept)
       => concept, conception, construct -- (an abstract or general idea inferred or derived from specific instances)

Sense 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")
       => idea, thought -- (the content of cognition; the main thing you are thinking about; "it was not a good idea"; "the thought never entered my mind")

Sense 4
notion -- ((usually plural) small personal articles or clothing or sewing items; "buttons and needles are notions")
       => article -- (one of a class of artifacts; "an article of clothing")