[{"Bold_text": "noun", "List Items": ["coincidence in pitch of two or more musical tones, voices, etc.", "the musical interval of a perfect prime.", "the performance of musical parts at the same pitch or at the octave.", "a sounding together in octaves, especially of male and female voices or of higher and lower instruments of the same class.", "a process in which all elements behave in the same way at the same time; simultaneous or synchronous parallel action:to march in unison."]}]