1. rarity, rareness, infrequency, scarcity, scarceness

usage: noteworthy scarcity

2. rarity, tenuity, low density, density, denseness

usage: a rarified quality; "the tenuity of the upper atmosphere"

3. curio, curiosity, oddity, oddment, peculiarity, rarity, object, physical object

usage: something unusual -- perhaps worthy of collecting

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See also: rarity (Dictionary)