verb

• (transitive) To encourage development or induce increased activity; to stimulate.
• (transitive) To put a device, mechanism (alarm etc.) or system into action or motion; to trigger, to actuate, to set off, to enable.
• (transitive, chemistry, physics) To render more reactive; excite.
• (transitive, biology) To render a molecule reactive, active, or effective in performing its function.
• (transitive, physics) To render a substance radioactive.
• (transitive, chemistry) To hasten a chemical reaction, especially by heating.
• (transitive, computing, software) To remove the limitations of demoware by providing a license; to unlock.
• (transitive) To aerate in order to aid decomposition of organic matter.
• (transitive, military) To organize or create a military unit or station.
• (transitive, sports) To bring a player back after an injury.