/ ˈhɑːməni; NAmE ˈhɑːrm-/ noun ( pl. -ies )
1.
[ U ] a state of peaceful existence and agreement :
the need to be in harmony with our environment
to live together in perfect harmony
social / racial harmony
—compare discord
2.
[ U , C ] ( music ) the way in which different notes that are played or sung together combine to make a pleasing sound :
to sing in harmony
to study four-part harmony
passionate lyrics and stunning vocal harmonies
—compare discord
3.
[ C , U ] a pleasing combination of related things :
the harmony of colour in nature
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WORD ORIGIN
late Middle English : via Old French from Latin harmonia joining, concord, from Greek , from harmos joint.