English definition of “tone”
SOUND QUALITY [C, U] › the quality of a sound, especially of someone's voice: I knew by her tone of voice that she was serious.
FEELING/STYLE [U, no plural] › the general feeling or style that something has: Then the director arrived and the whole tone of the meeting changed.
TELEPHONE [C] › an electronic sound made by a telephone: a dialling tone/an engaged tone
COLOUR [C] › one of the many types of a particular colour