Agreement in feeling or opinion; accord: live in harmony. A pleasing combination of elements in a whole: color harmony; the order and harmony of the universe. See Synonyms at proportion. Music The study of the structure, progression, and relation of chords. Music Simultaneous combination of notes in a chord. Music The structure of a work or passage as considered from the point of view of its chordal characteristics and relationships. Music A combination of sounds considered pleasing to the ear. A collation of parallel passages, especially from the Gospels, with a commentary demonstrating their consonance and explaining their discrepancies.