notion in WordNet English dictionary

1. 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"
   impression  feeling  belief  notion  opinion 
   
2. (usually plural) small personal articles or clothing or sewing items
   "buttons and needles are notions"
   notion 
   
3. a general inclusive concept
   notion 
   
4. 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"
   notion  whim  whimsy  whimsey