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rarity (n.)

early 15c., rarite, "thinness, porosity, condition of being not dence;" 1550s, "fewness, state of being uncommon," from French rarité and directly from Latin raritas "thinness, looseness of texture; fewness," from rarus (see rare (adj.1)). Sense of "a rare thing or event, thing valued for its scarcity or unusual excellence" is from 1590s.

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Definitions of rarity from WordNet

rarity (n.)
noteworthy scarcity;
Synonyms: rareness / infrequency
rarity (n.)
a rarified quality;
Synonyms: tenuity / low density
rarity (n.)
something unusual -- perhaps worthy of collecting;
Synonyms: curio / curiosity / oddity / oddment / peculiarity
From wordnet.princeton.edu