WordWeb Online

1. Any structure that makes progress difficult
   - obstructor, obstructer, impediment, impedimenta
    
2. The physical condition of blocking or filling a passage with an obstruction
   - blockage
    
3. Something immaterial that stands in the way and must be circumvented or surmounted
   "the filibuster was a major obstruction to the success of their plan";
   - obstacle
    
4. The act of obstructing
   "obstruction of justice"
    
5. Getting in someone's way

Derived forms: obstructions

Type of: balk, baulk [Brit], check, construction, deterrent, handicap, hinderance, hindrance, impediment, interference, maneuver [US], manoeuvre [Brit, Cdn], physical condition, physiological condition, physiological state, play, structure

Encyclopedia: Obstruction