The Collaborative International Dictionary of English v.0.48:

Maximize \Max"i*mize\, v. t. [L. maximus greatest.]
   To increase to the highest degree. --Bentham.
   [1913 Webster]

WordNet (r) 3.0 (2006):

maximize
    v 1: make as big or large as possible; "Maximize your profits!"
         [syn: maximize, maximise] [ant: minimise, minimize]
    2: make the most of; "He maximized his role" [syn: maximize,
       maximise]

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "maximize":
   add to, aggrandize, amplify, augment, boost, broaden, build,
   build up, elaborate, embellish, enhance, enlarge, exaggerate,
   exalt, expand, extend, fatten, fill out, hike, hike up, improve,
   increase, inflate, jack up, jump up, lengthen, magnify,
   make much of, overdo, overemphasize, overplay, oversell, overstate,
   overstress, parlay, put up, pyramid, raise, thicken, up