WordWeb Online

1. Noteworthy scarcity
   - rareness, infrequency
    
2. A rarified quality
   "the rarity of the upper atmosphere";
   - tenuity, low density
    
3. Something unusual -- perhaps worthy of collecting
   - curio, curiosity, oddity, oddment, peculiarity

Derived forms: rarities

Type of: article, denseness, density, object, physical object, scarceness, scarcity

Encyclopedia: Rarity