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From The Collaborative International Dictionary of English v.0.48:
Obstruction \Ob*struc"tion\, n. [L. obstructio.] 1. The act of obstructing, or state of being obstructed. [1913 Webster] 2. That which obstructs or impedes; an obstacle; an impediment; a hindrance. [1913 Webster] A popular assembly free from obstruction. --Swift. [1913 Webster] 3. The condition of having the natural powers obstructed in their usual course; the arrest of the vital functions; death. [Poetic] [1913 Webster] To die, and go we know not where, To lie in cold obstruction, and to rot. --Shak. [1913 Webster] Syn: Obstacle; bar; barrier; impediment; clog; check; hindrance. Usage: Obstruction, Obstacle. The difference between these words is that indicated by their etymology; an obstacle is something standing in the way; an obstruction is something put in the way. Obstacle implies more fixedness and is the stronger word. We remove obstructions; we surmount obstacles. [1913 Webster] Disparity in age seems a greater obstacle to an intimate friendship than inequality of fortune. --Collier. [1913 Webster] The king expected to meet with all the obstructions and difficulties his enraged enemies could lay in his way. --Clarendon. [1913 Webster]