Crenelation (noun)

1. The act of creating crenels in a fortification or building.
2. The crenels or notches themselves in a fortification or building.

Origin:

From the french word créneler, meaning 'to notch'. this refers to the notched appearance of a fortification or building that has crenelations.

Examples:

1. The castle's crenelation provided protection for the soldiers while allowing them to fire arrows at the enemy.
2. The architect designed the building with decorative crenelations, adding to its medieval appearance.
3. During a siege, the defenders would use the crenelation to their advantage, firing arrows and dropping stones on the enemy.
4. The historian studied the crenelation of the castle, learning about its military importance.
5. The young prince was fascinated by the crenelation and wanted to learn more about castle warfare.