The Collaborative International Dictionary of English v.0.48:

activated \activated\ adj.
   1. (Sewage treatment) treated with aeration and bacteria to
      aid decomposition; -- of sewage
      [WordNet 1.5]

   3. (Physics) made reactive or more reactive; -- of e.g. a
      molecule

   Syn: activated, excited
        [WordNet 1.5]

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

   Syn: activated
        [WordNet 1.5]

   5. (Military) set up and placed on active assignment a newly
      activated unit

   Syn: activated
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

activated
    adj 1: (of sewage) treated with aeration and bacteria to aid
           decomposition
    2: (of e.g. a molecule) made reactive or more reactive [syn:
       activated, excited]
    3: rendered active; e.g. rendered radioactive or luminescent or
       photosensitive or conductive
    4: (military) set up and placed on active assignment; "a newly
       activated unit"