definition of
rarity

[1] #1 rarity n. [rareness, infrequency] noteworthy scarcity. wn

[2] #2 rarity n. [tenuity, low density] a rarified quality; "the tenuity of the upper atmosphere". wn

[3] #3 rarity n. [curio, curiosity, oddity, oddment, peculiarity] something unusual -- perhaps worthy of collecting. wn