n.1 the act or an instance of blocking; the state of being blocked.
2 the act of making or the state of becoming more or less impassable.
3 an obstacle or blockage.
4 the retarding of progress by deliberate delays, esp. of Parliamentary business.
5 Sport the act of unlawfully obstructing another player.
6 Med. a blockage in a bodily passage, esp. in an intestine.
Derivatives:
obstructionism n. (in sense 4). obstructionist n. (in sense 4).
Etymology: L obstructio (as OBSTRUCT)