Definition of rarity noun from the Oxford Advanced American Dictionary

     

    rarity

     noun
    noun
    NAmE//ˈrɛrət̮i//
     
    (pl. rarities)
     
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  1. 1[countable] a person or thing that is unusual and is therefore often valuable or interesting Women are still something of a rarity in senior positions in business. His collection of plants contains many rarities.
  2. 2(rareness) [uncountable] the quality of being rare The value of antiques will depend on their condition and rarity.
See the Oxford Advanced Learner's Dictionary entry: rarity