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A Unison

  1. (music, acoustics) Identical pitch between two notes or sounds; the simultaneous playing of notes of identical pitch (or separated by one or more octaves). [from 15th c.]
  2. (music, acoustics) A sound or note having the same pitch as another, especially when used as the base note for an interval; a unison string. [from 15th c.]
  3. The state of being in harmony or agreement; harmonious agreement or togetherness, synchronisation. [from 17th c.]
  4. (by extension) Two or more voices speaking or singing the same words together.