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obstruction [əb'strʌkʃ(ə)n] abbr.
abbr., mil.	obst; obstn
avia., Canada	All fixed whether temporary or permanent and mobile objects, or parts thereof, that are located on an area intended for the surface movement of aircraft or that extend above a defined surface intended to protect aircraft in flight
mil., abbr.	ob
mil., logist.	Movement hindrance built without destroying or damaging the route itself. (FRA)