Webster's English Dictionary

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adultery

adul.tery \*-'d*l-t(*-)re-\ n [ME, alter. of avoutrie, fr. MF, fr. L 
   adulterium, fr. adulterX adulterer, back-formation fr. adulterare : 
   voluntary sexual intercourse between a married man and someone other tha n 
   his wife or between a married woman and someone other than her husband