In physics, in a state or condition of acquired radioactivity; ionized.

adjective. treated with aeration and bacteria to aid decomposition; -- of sewage.

adjective. made reactive or more reactive; -- of e.g. a molecule.

adjective. rendered active; -- as e.g. radioactive or luminescent or photosensitive or conductive.

adjective. set up and placed on active assignment.

verb. Simple past tense and past participle of activate.

adjective. (of e.g. a molecule) made reactive or more reactive

adjective. (military) set up and placed on active assignment

adjective. (of sewage) treated with aeration and bacteria to aid decomposition

adjective. rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive

"And make sure that he installs a little something that can an crash a system when activated from the footpath."

active  reactive  treated  

deactivated  inactivated  

activate