WordWeb Online

1. An increase in width
   - broadening
    
2. A part of a road that has been widened to allow cars to pass or park
   - turnout [N. Amer]
    
3. The act of making something wider
   - broadening

1. Become broader, wider or more extensive
   "The road widened"
    
2. Make (clothes) larger
   "widen that dress--I gained a lot of weight";
   - let out
    
3. Make wider
   "widen the road"
    
4. Increase in scope, range or area
   "widen the range of applications";
   - broaden, extend

Derived forms: widenings

Type of: alter, change, change of shape, growth, increase, increment, modify, part, portion, vary

Antonym: contract, narrowing

Part of: road, route

Encyclopedia: Widening