noun, plural rar·i·ties.

  1. something rare, unusual, or uncommon: Snowstorms are a rarity in the South.
  2. something esteemed or interesting in being rare, uncommon, or curious: That folio is a rarity that will bring a good price.
  3. the state or quality of being rare.
  4. rare occurrence; infrequency: Volcanic eruptions on the island occur with great rarity.
  5. unusual excellence.
  6. thinness, as of air or a gas.

noun plural -ties

  1. a rare person or thing, esp something interesting or valued because it is uncommon
  2. the state or quality of being rare

early 15c., “thinness;” 1550s, “fewness,” from Middle French rarité or directly from Latin raritas “thinness, looseness of texture; fewness,” from rarus (see rare (adj.1)). Sense of “a rare thing or event” is from 1590s.

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