Double adultery
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Adultery committed by two persons each of whom is married to another as distinguished from "single" adultery, where one of the participants is unmarried. Hunter v. U. S., 1 Pin. (Wist) 91, 39 Am. Dec. 277.
Defined under Double in Black's Law Dictionary.