/ hɑːˈmɒnɪk; NAmE hɑːrˈmɑːn-/ adjective , noun
■ adjective
[ usually before noun ] ( music ) relating to the way notes are played or sung together to make a pleasing sound
■ noun [ usually pl. ] ( music )
1.
a note that sounds together with the main note being played and is higher and quieter than that note
2.
a high quiet note that can be played on some instruments like the violin by touching the string very lightly
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WORD ORIGIN
late 16th cent. (in the sense relating to music, musical ): via Latin from Greek harmonikos , from harmonia joining, concord, from harmos joint.