noun (n)

• a musical passage moving from one key to another(noun.communication)

  Synonym:
  transition
  

  source: wordnet30
• (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phase(noun.communication)

  source: wordnet30
• rise and fall of the voice pitch(noun.communication)

  Synonym:
  intonation, pitch contour
  

  source: wordnet30
• a manner of speaking in which the loudness or pitch or tone of the voice is modified(noun.communication)

  Synonym:
  inflection
  

  source: wordnet30
• the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)(noun.act)

  source: wordnet30
• The act of modulating, or the state of being modulated; as, the modulation of the voice.(noun)

  source: webster1913