adultery
‘voluntary sexual intercourse between a married person and a partner other than the lawful spouse’
Lexical development traced from the Tamil root:
E. aduoulterie, aduoultre adultrye, adultrie < M.F. adultĕre < O.F. avouterie < avoutre < Lat. adulterare ‘commit adultery; corrupt’ < ad- ‘to, near, at’ + alterare ‘to alter’ < alter ‘the other (of the two)’ < al- + -ter < uhl < Tamil al