1. Lessen the density or solidity of
   - rarefy
    
2. (chemistry) weaken the consistency of (a chemical substance)
   "The mixture was rarified through distillation";
   - rarefy, attenuate
    
3. Make more subtle or refined
   "The philosopher rarified the concept to its essence";
   - rarefy, sublimate, subtilize, subtilise [Brit]
    
4. Make more complex, intricate, or rich
   "rarify a design or pattern";
   - complicate, refine, elaborate, rarefy

Derived forms: rarified, rarifies, rarifying

Type of: alter, change, modify, weaken

Encyclopedia: Rarify