obstrucción

n. obstruction, that which obstructs; obstacle; interference; hindrance, impediment; blockade

= obstruction, blockage.
Ex: Harmonization of technical standards is one of the Community's principal goals in creating a common market devoid of obstructions to the free movement of goods.
Ex: The problem in relation to communication is probably the most difficult of them all, as the blockage lies in people rather than with the library.
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* obstrucción de las vías respiratorias = airway blockage.