obstruction in British English. See all translations. obstructionnoun. uk ​ /əbˈstrʌk.ʃən/ us ​ /əbˈstrʌk.ʃən/. › [ C or U ] something that blocks a road, passage, entrance, etc. so that nothing can go along it, or the act of blocking something in this way: There's some kind of obstruction on the railway tracks.