Definitions

1. verb

to put (a machine or other device) into operation, or to cause (a process) to start

“The button actuated the alarm, which started ringing loudly.”

2. verb

to influence or prompt (someone) to do something

“The news article actuated the politician to take action on the issue.”

3. noun

a device used to operate or control a machine

“The actuator was used to move the robotic arm.”