1. [ adjective ] (of sewage) treated with aeration and bacteria to aid decomposition
Related terms: treated
2. [ adjective ] rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive
Related terms: active
3. [ adjective ] (physics) of e.g. a molecule; made reactive or more reactive
Synonyms: excited
Related terms: physics reactive
4. [ adjective ] (military) set up and placed on active assignment

"a newly activated unit"

Related terms: military active
Similar spelling:   activate