WordWeb Online

1. A change for the better; progress in development
   - improvement, advance
    
2. An improvement that adds to the value of a property or facility
    
3. The act of relieving ills and changing for the better
   - amelioration, melioration

Derived forms: betterments

See also: better

Type of: improvement, melioration, shift, transformation, transmutation

Encyclopedia: Betterment