1. (

• rarity ,
• rareness ,
• infrequency

) noteworthy scarcity ;

2. (

• rarity ,
• tenuity ,
• low_density

) a rarified quality; "the tenuity of the upper atmosphere" ;

3. (

• curio ,
• curiosity ,
• oddity ,
• oddment ,
• peculiarity ,
• rarity

) something unusual ;