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]