obstruction in WordNet English dictionary

1. the physical condition of blocking or filling a passage with an obstruction
   obstruction  blockage 
   
2. any structure that makes progress difficult
   obstruction  obstructor  obstructer  impediment  impedimenta 
   
3. something immaterial that stands in the way and must be circumvented or surmounted
   "lack of imagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan"
   obstacle  obstruction 
   
4. getting in someone's way
   obstruction 
   
5. the act of obstructing
   "obstruction of justice"
   obstruction