noun
1. getting in someone's way
2. the act of obstructing
e.g. obstruction of justice
3. any structure that makes progress difficult
Synonym: obstructorobstructerimpedimentimpedimenta
4. something immaterial that stands in the way and must be circumvented or surmounted
e.g. 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
Synonym: obstacle
5. the physical condition of blocking or filling a passage with an obstruction
Synonym: blockage