noun (n)

• eccentricity that is not easily explained(noun.attribute)

  Synonym:
  oddness
  

  source: wordnet30
• a strange attitude or habit(noun.attribute)

  Synonym:
  crotchet, queerness, quirk, quirkiness
  

  source: wordnet30
• something unusual -- perhaps worthy of collecting(noun.artifact)

  Synonym:
  curio, curiosity, oddment, peculiarity, rarity
  

  source: wordnet30
• The quality or state of being odd; singularity; queerness; peculiarity; as, oddity of dress, manners, and the like.(noun)

  source: webster1913