the pleasant-sounding combination of simultaneous musical notes in a chord
the structure of music with respect to the composition and progression of chords, or the science of the structure of music in this respect
pleasing or congruent arrangement of parts
a painting exhibiting harmony of colour and line
agreement or accord
live in harmony with one's neighbours
an arrangement of parallel literary passages, e.g. of the Gospels
[Middle English armony via French and Latin from Greek harmonia joining, harmony, from harmos joint]