1. a mechanical device that controls or moves another mechanism or system
Usage: technical; engineering

Examples

• The robotic arm uses hydraulic actuators to lift heavy objects.
• An electric actuator opens and closes the valve automatically.
• The aircraft’s flight control surfaces are moved by servo actuators.
• The garage door actuator stopped working during the storm.
• Engineers installed pneumatic actuators to control the manufacturing equipment.
• The car’s brake system includes several electronic actuators for safety features.