unison
‘concord, harmony’
Lexical development traced from the Tamil root:
E. vnisoun, vnysion, vnyson, unisone < F. unisson ‘unison, accord of sound’ < Med.Lat. unisonus ‘having one sound, sounding the same’ < La.Lat. unisonius ‘in immediate sequence in the scale, monotonous’ < Lat. uni- ‘one’ + sonus ‘sound’ < yoonuh < oi-no- < Tamil oṉṟu