noun. 
                    The act of obstructing, blocking up, or impeding passage, or the fact of being obstructed; the act of impeding passage or movement; a stopping or retarding: as, the obstruction of a road or thoroughfare by felled trees; the obstruction of one's progress or movements.
                  
                
                  
                    noun. 
                    That with which a passage is blocked or progress or action of any kind hindered or impeded; anything that stops, closes, or bars the way; obstacle; impediment; hindrance: as, obstructions to navigation; an obstruction to progress.
                  
                
                  
                    noun. 
                    Stoppage of the vital function; death.
                  
                
                  
                    noun. 
                    Systematic and persistent factious opposition, especially in a legislative body; factious attempts to hinder, delay, defeat, or annoy.
                  
                
                  
                    noun. 
                    Synonyms Difficulty, Impediment, etc. (see obstacle), bar, barrier.