Harmonize v. i. : To agree in action, adaptation, or effect on the mind; to agree in sense or purport; as, the parts of a mechanism harmonize.

Harmonize v. i. : To be in peace and friendship, as individuals, families, or public organizations.

Harmonize v. i. : To agree in vocal or musical effect; to form a concord; as, the tones harmonize perfectly.

Harmonize v. t. : To adjust in fit proportions; to cause to agree; to show the agreement of; to reconcile the apparent contradiction of.

Harmonize v. t. : To accompany with harmony; to provide with parts, as an air, or melody.

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Taxonomy
harmony, intervals, chord, tension, pitches, music, Macy, harmonic, scale, composition, sounding, aesthetics, Western music, Music improvisation, balance, ratios, Eb, listener.

Defination from the web:
harmonization usually sounds pleasant to the ear when there is a balance between the consonant and dissonant sounds. ... Interactive Lessons about harmonizing melodies and scales using different Musical Styles. Harmonic Progressions with demos and how to harmonize a melody ...