1》 relating to or characterized by harmony: a four-chord harmonic sequence.
2》 Music relating to or denoting a harmonic or harmonics.
3》 Mathematics relating to a harmonic progression.
    ↘Physics of or denoting components of a complex oscillation or wave whose frequencies are exact multiples of the basic frequency.
4》 Astrology relating to a division of the zodiacal circle by a whole number.
1》 Music an overtone accompanying a fundamental tone at a fixed interval, produced by vibration of a string, column of air, etc. in an exact fraction of its length.
    ↘a note produced on a musical instrument as an overtone, e.g. by lightly touching a string while sounding it.
2》 Physics a harmonic component of a complex oscillation or wave.
harmonically adverb

English new terms dictionary. 2014.