IPA: //ˈæk.tʃu.eɪt//
KK: /ˈæk.tʃu.eɪt/
To cause someone or something to take action or to start a process.
The manager decided to actuate the new policy immediately.
Past: actuated
Past Participle: actuated
Actuate is formed from "act" (from Latin "agere", meaning to do or to drive) and "-uate" (a suffix used in forming verbs). The word means to put into action or to drive into motion.
Think of 'doing' ('act') something to 'put it into action' ('-uate'). This helps you remember that to actuate means to make something happen.