The Collaborative International Dictionary of English v.0.48:

normalize \normalize\ v.
   1. To make normal; as, to normalize relations with China.

   Syn: renormalize.
        [WordNet 1.5]

   2. To make standard; determine the value by comparison to an
      item of known standard value; as, The test results were
      normalized for changes in the number of questions before
      comparison with the previous year's values.

   Syn: standardize.
        [PJC]

   3. To convert to a standard form or measure; adjust the value
      or values so as to conform to a standard measure or
      pattern; as, The probabilities were normalized to add up
      to 1.00.
      [PJC]

WordNet (r) 3.0 (2006):

normalize
    v 1: become normal or return to its normal state; "Let us hope
         that relations with this country will normalize soon" [syn:
         normalize, normalise]
    2: make normal or cause to conform to a norm or standard;
       "normalize relations with China"; "normalize the
       temperature"; "normalize the spelling" [syn: normalize,
       normalise, renormalize, renormalise]
    3: bring to a desired consistency, texture, or hardness by a
       process of gradually heating and cooling; "temper glass"
       [syn: anneal, temper, normalize]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "normalize":
   adjust, arrange, array, assimilate to, balance, chart, codify,
   conform, control, cool off, coordinate, damp, deploy, dispose,
   equalize, equilibrize, even, fix, flatten, form, formalize, grade,
   harmonize, hierarchize, homogenize, lay out, level, line up,
   make uniform, marshal, methodize, order, organize, pacify, plan,
   quiet, rank, rationalize, regularize, regulate, routinize, set up,
   settle, smooth, stabilize, standardize, stereotype, structure,
   symmetrize, synchronize, systematize, tranquilize, tune, tune up,
   uniformize