Webster's English Dictionary

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obstruction

ob.struc.tion \*b-'str*k-sh*n, a:b-\ n 1: an act of obstructing : the state 
   of being obstructed : as  1a: a condition of being clogged or blocked  1b: 
   a delay or attempted delay of business in a deliberative body  2: something 
   that obstructs : HINDRANCE