rarity - definition and synonyms

noun 

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/ˈreərəti/
singularrarity
pluralrarities
  1. 1
    [singular] something that does not happen often

    Visits by presidential candidates are a rarity here.

  2. 2
    [countable] someone or something that is admired or valued because you do not often see or find them

    He is that rarity: a true man of science.

  3. 3
    [uncountable] the fact that something is unusual or does not happen often

    The importance of the find lies in its rarity.