Quick definitions from WordNet (harmony)

▸ noun:  compatibility in opinion and action
▸ noun:  an agreeable sound property
▸ noun:  the structure of music with respect to the composition and progression of chords
▸ noun:  agreement of opinions
▸ noun:  a harmonious state of things in general and of their properties (as of colors and sounds); congruity of parts with one another and with the whole
▸ name:  A female given name (rare: 1 in 50000 females; popularity rank in the U.S.: #2229)

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▸ Also see harmony