noun

• the quality of a person's voice
  "he began in a conversational tone"
• (linguistics) a pitch or change in pitch of the voice that serves to distinguish words in tonal languages
  "the Beijing dialect uses four tones"
• (music) the distinctive property of a complex sound (a voice or noise or musical sound)
  "the timbre of her soprano was rich and lovely"
• the general atmosphere of a place or situation and the effect that it has on people
  "the feel of the city excited him"

verb

• utter monotonously and repetitively and rhythmically
  "The students chanted the same slogan over and over again"
• vary the pitch of one's speech
• change the color or tone of
  "tone a negative"
• change to a color image
  "tone a photographic image"