Source : Webster's Revised Unabridged Dictionary (1913)

Harmonize \Har"mo*nize\, v. i. [imp. & p. p. {Harmonized}; p.
   pr. & vb. n. {Harmonizing}.] [Cf. F. harmoniser. ]
   1. To agree in action, adaptation, or effect on the mind; to
      agree in sense or purport; as, the parts of a mechanism
      harmonize.

   2. To be in peace and friendship, as individuals, families,
      or public organizations.

   3. To agree in vocal or musical effect; to form a concord;
      as, the tones harmonize perfectly.

Harmonize \Har"mo*nize\, v. t.
   1. To adjust in fit proportions; to cause to agree; to show
      the agreement of; to reconcile the apparent contradiction
      of.

   2. (Mus.) To accompany with harmony; to provide with parts,
      as an air, or melody.

Source : WordNet®

harmonize
     v 1: go together; "The colors don't harmonize"; "Their ideas
          concorded" [syn: {harmonise}, {consort}, {accord}, {concord},
           {fit in}, {agree}]
     2: write a harmony for [syn: {harmonise}]
     3: sing or play in harmony [syn: {harmonise}]
     4: bring into consonance or relate harmoniously; "harmonize the
        different interests" [syn: {harmonise}]
     5: bring into consonance or accord; "harmonize one's goals with
        one's abilities" [syn: {harmonise}, {reconcile}]
     6: bring into consonance, harmony, or accord while making music
        or singing [syn: {harmonise}, {chord}]