1. a series of rectangular notches or indentations along the top of a wall or building, especially on medieval castles and fortifications
Usage: architecture; fortification
2. any notched or indented edge resembling castle battlements

Examples

• The castle’s crenellation provided archers with protection while allowing them to shoot at enemies.
• Medieval fortifications are easily recognized by their distinctive crenellation along the walls.
• The architect incorporated crenellation into the modern building’s design as a decorative element.
• From a distance, the crenellation of the fortress created a jagged silhouette against the sky.
• The leaf’s edge showed a natural crenellation that resembled tiny castle battlements.
• Restoration work focused on repairing the damaged crenellation of the ancient tower.