[1] : WordNet (r) 2.0

act on
     v 1: carry further or advance; "can you act on this matter soon?"
          syn: pursue, follow up on
     2: regulate one's behavior in accordance with certain
        information, ideas, or advice; "the founding fathers acted
        on certain moral principles"
see also:
pursue follow up on 

[2] : Moby Thesaurus II by Grady Ward, 1.0

54 moby thesaurus words for "act on":
   act upon, affect, approach, bear a hand, bear upon, concentrate on,
   condemn, decree, do something, do something about, doom, draw,
   draw on, exert influence, find, find against, find for, focus on,
   get cozy with, get with it, go, influence, lead on, lift a finger,
   lobby, lobby through, magnetize, make advances, make overtures,
   make up to, maneuver, operate on, order, pass judgment,
   pass sentence, proceed, proceed with, pronounce,
   pronounce judgment, pronounce on, pull strings, report,
   return a verdict, rule, sentence, strike a blow, take a hand,
   take action, take measures, take steps, treat, utter a judgment,
   wire-pull, work on

Act >> A Words
Act, definition of term: Act
act_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html

Act Out >> A Words
Act Out, definition of term: Act Out
act+out_pag1.html

Act On >> A Words
Act On, definition of term: Act On
act+on_pag1.html

Act Of God >> A Words
Act Of God, definition of term: Act Of God
act+of+god_pag1.html