n.; pl.Rarities [ L. raritas: cf. F. rareté. See Rare. ] 1. The quality or state of being rare; rareness; thinness; as, the rarity (contrasted with the density) of gases. [ 1913 Webster ]
2. That which is rare; an uncommon thing; a thing valued for its scarcity. [ 1913 Webster ]
I saw three rarities of different kinds, which pleased me more than any other shows in the place. Addison. [ 1913 Webster ]