WordWeb Online

1. The act of making something wider
   - widening
    
2. The action of making broader
   "the broadening of travel"
    
3. An increase in width
   - widening

1. Make broader
   "broaden the road"
    
2. Extend in scope or range or area
   "broaden your horizon"
   - widen, extend
    
3. Vary in order to spread risk or to expand
   - diversify, branch out
    
4. Become broader
   "The road broadened"

Derived forms: broadenings

Type of: alter, change, change of shape, development, growth, increase, increment, vary