Any group of individuals who join a protest or demonstration, wearing black clothing including items to protect and/or conceal their faces and often engaging in violence and vandalism; the tactic of forming and participating in such a group.

(Canada) Alternative spelling of Bloc Québécois

(Canadian politics) A Canadian federal political party, with the goal of sovereignty for Quebec.

plural of black bloc

plural of trade bloc

plural of en bloc clip

(military) A clip holding several rounds of ammunition for a firearm, which is inserted into the firearm's internal magazine to load the weapon, remains in the weapon while firing, and is removed or ejected when its supply of ammunition is exhausted.

(architecture) The roughest and cheapest sort of rubblework, in masonry.