1. a position or location where a gun, cannon, or other military equipment is mounted or installed for use
Usage: military; often used in plural
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 unit established gun emplacements along the ridge.
• Soldiers prepared the emplacement for the heavy cannon.
• The fortress had multiple defensive emplacements overlooking the valley.
• The emplacement of the new radar system took several weeks.
• Enemy forces targeted the missile emplacement from the air.
• Engineers surveyed the terrain to find suitable emplacements for the weapons.