WordNet (r) 3.0 (2006):

look up
    v 1: seek information from; "You should consult the dictionary";
         "refer to your notes" [syn: consult, refer, look up]

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "look up":
   advance, ameliorate, amend, angle for, ask for, beat about for,
   call, come along, come by, come on, come over, convalesce,
   delve for, develop, dig for, drop in, fish for, follow, gain,
   gain ground, get ahead, get along, go ahead, go forward,
   go gunning for, graduate, grow better, gun for, hunt, hunt for,
   hunt up, improve, look, look for, look in, make headway,
   make progress, make strides, meliorate, mend, perk up, pick up,
   pop in, progress, prowl after, pursue, quest, recuperate, run in,
   search for, see, see to, seek, seek for, shape up,
   show improvement, skyrocket, step in, still-hunt, take off,
   try to find