[har.mon.ic] adj (1570) 1: musical
2: of or relating to musical harmony or a harmonic
3: pleasing to the ear: harmonious
4: of an integrated nature: congruous -- har.mon.i.cal.ly adv
[2]harmonic n (1777) 1 a: overtone; esp: one whose vibration frequency is an integral multiple of that of the fundamental b: a flutelike tone produced on a stringed instrument by touching a vibrating string at a nodal point
2: a component frequency of a complex wave (as of electromagnetic energy) that is an integral multiple of the fundamental frequency