Definition of "battlement" in English

noun

1. In fortification: an indented parapet, formed by a series of rising members called cops or merlons, separated by openings called crenelles or embrasures, the soldier sheltering himself behind the merlon while he fires through the embrasure or through a loophole in the battlement.

2. Any high wall for defense.

3. (poetic) The towering roof of heaven.