One entry found for unison.

Main Entry: uni·son
Pronunciation: yü-n-sn, -zn
Function: noun
Etymology: from early French unisson "having the same musical pitch," from Latin unisonus "having the same sound," from uni- "one" (from unus "one") and sonus "a sound" --related to ³SOUND, UNITE
1 : sameness of musical pitch
2 : the condition of being tuned or sounded at the same pitch or at an octave <sing in unison rather than in harmony>
3 : exact agreement : ACCORD <all are in unison on the next move>