activate /ˈæktɪˌveɪt/verb 11forms 3 verb11 •To put a device, mechanism (alarm etc.) or system into action or motion; to trigger, to actuate, to set off, to enable.The pranksters activated the fire alarm by spraying deodorant next to it. •To remove the limitations of demoware by providing a license; to unlock. •To enter an active state.The burglar alarm activates automatically. •To render more reactive; excite. •To render a molecule reactive, active, or effective in performing its function. •To encourage development or induce increased activity; to stimulate. •To organize or create a military unit or station.A new squadron was activated. •To bring a player back after an injury. •To render a substance radioactive. •To hasten a chemical reaction, especially by heating. •To aerate in order to aid decomposition of organic matter. formsactivated · activating · activates