'obstruction' definitions:

Definition of 'obstruction'

From: WordNet
noun
Any structure that makes progress difficult [syn: obstruction, obstructor, obstructer, impediment, impedimenta]
noun
The physical condition of blocking or filling a passage with an obstruction [syn: obstruction, blockage]
noun
Something immaterial that stands in the way and must be circumvented or surmounted; "lack of imagination is an obstacle to one's advancement"; "the poverty of a district is an obstacle to good education"; "the filibuster was a major obstruction to the success of their plan" [syn: obstacle, obstruction]
noun
The act of obstructing; "obstruction of justice"
noun
Getting in someone's way

Synonyms of 'obstruction'

From: Moby Thesaurus