Webster's English Dictionary

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notion

Cross references:
  1. idea                  
 
no.tion \'no--sh*n\ n [L notion-, notio, fr. notus, pp. of noscere] 1a1: an 
   inclusive general concept  1a2: an individual's conception or impression of 
   something known, experienc ed, or imagined 1a3: a theory or belief held by 
   a person or group  1b: INCLINATION, WHIM  obs  2: MIND, INTELLECT  3a: an 
   ingenious device : KNICKKNACK  pl  3b: small personal and clothing items 
   (as ribbons)