n.
Pronunciation: ' yü-n ə -s ə n, -n ə -z ə n
Function: noun
Etymology: Middle English unisoun, from Middle French unisson, from Medieval Latin unisonus having the same sound, from Latin uni- + sonus sound ― more at SOUND
Date: 15th century
1 a : identity in musical pitch specifically : the interval of a perfect prime b : the state of being so tuned or sounded c : the writing, playing, or singing of parts in a musical passage at the same pitch or in octaves
2 : a harmonious agreement or union : CONCORD
– unison adjective
– in unison
1 : in perfect agreement : so as to harmonize exactly <a class reciting in unison >
2 : at the same time : SIMULTANEOUSLY