rarity

RAR'ITY, n. [L. raritas.]

1. Uncommonness; infrequency.

Far from being fond of a flower for its rarity -

2. A thing valued for its scarcity.

I saw three rarities of different kinds, which pleased me more than any other shows in the place.

3. Thinness; tenuity; opposed to density; as the rarity of air.