1. to cause something to operate or function; to activate
2. to motivate or drive someone to take action

Examples

• The sensor actuates the automatic door when someone approaches.
• A small motor actuates the windshield wipers.
• Fear of failure actuates many students to study harder.
• The remote control actuates the garage door opener.
• What actuates his desire to help others is unclear.
• The thermostat actuates the heating system when the temperature drops.
• Curiosity actuates her scientific research.