1 [uncountable and countable]
when something blocks a road, passage, tube etc, or the thing that blocks it [= blockage]:
an operation to remove an obstruction from her throat
Police can remove a vehicle that is causing an obstruction.
an unlawful obstruction of the highway
when someone or something prevents or delays a legal or political process
the obstruction of vital legislation
He was found guilty of obstruction of justice.
an offence in football, hockey etc in which a player gets between an opponent and the ball