1. A position or site where a gun, cannon, or other military equipment is mounted or installed for use.
Usage: Usually plural; military/defense context
2. The act or process of putting something in position or placing it in a particular location.
Usage: Formal; less common than sense 1

Examples

• The artillery emplacements were strategically positioned along the ridge.
• Soldiers reinforced the gun emplacements before the attack.
• The fortress contained multiple cannon emplacements overlooking the harbor.
• Engineers surveyed the area to determine suitable emplacements for the defensive weapons.
• The enemy destroyed several of our forward emplacements during the bombardment.