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rarity

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noun American English pronunciation: rarity /ˈrerəti/ 
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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

    Bananas, once rarities in Soviet states, are now widely available.

    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.

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