noun
a noun refers to a person, place, thing, or idea. In this case, 'rarity' is a noun that means the state or quality of being rare, uncommon, or unusual.
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The gemstone was a true rarity, with only a few known to exist in the world.
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Finding a vintage car in such good condition is a real rarity these days.
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Getting a perfect score on that test is a total rarity, dude.
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In a world full of chaos, finding inner peace can be considered a rarity.