harmonic

Short definition from Wiktionary

Adjective

1. 1
   Pertaining to harmony.
2. 2
   Pleasant to hear; harmonious; melodious.
3. 3
   Used to characterize various mathematical entities or relationships supposed to bear some resemblance to musical consonance.
4. 4
   Recurring periodically.
5. 5
   Exhibiting or applying constraints on what vowels (e.g. front/back vowels only) may be found near each other and sometimes in the entire word.
6. 6
   Of or relating to a generation an even number of generations distant from a particular person.

Noun

1. 1
   A component frequency of the signal of a wave that is an integer multiple of the fundamental frequency.
2. 2
   The place where, on a bowed string instrument, a note in the harmonic series of a particular string can be played without the fundamental present.
3. 3
   One of a class of functions that enter into the development of the potential of a nearly spherical mass due to its attraction.
4. 4
   One's child.