(adjective, verb)


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

Similar word(s): treated

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

Similar word(s): reactive, excited

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

Similar word(s): active

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

- a newly activated unit

Similar word(s): active


1. simple past tense and past participle of activate