noun (n)

• (usually plural) an ulterior implicit meaning or quality(noun.communication)

  Example:
  Overtones of despair.
  

  source: wordnet30
• a harmonic with a frequency that is a multiple of the fundamental frequency(noun.cognition)

  Synonym:
  partial, partial tone
  

  source: wordnet30
• One of the harmonics faintly heard with and above a tone as it dies away, produced by some aliquot portion of the vibrating sting or column of air which yields the fundamental tone; one of the natural harmonic scale of tones, as the octave, twelfth, fifteenth, etc.; an aliquot or "partial" tone; a harmonic. See Harmonic, and Tone.(noun)

  source: webster1913