ob·struc·tion / əbˈstrəkshən; äb-/ • n. the action of obstructing or the state of being obstructed: they faced obstruction in carrying out their research walkers could proceed with the minimum of obstruction. ∎ a thing that impedes or prevents passage or progress; an obstacle or blockage: the tractor hit an obstruction. ∎ (in various sports) the action of unlawfully obstructing a player on the opposing team. ∎ Med. blockage of a bodily passageway, as the intestines. ∎ Law the action of deliberately hindering a legal process.
—obstructive (ŏb-struk-tiv) adj.