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.