Sacramentum decisionis
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The voluntary cr decisive oath of the civil law, where one of the parties to a suit, not being able to prove his case, offers to refer the decision of the cause to the oath of his adversary, who is bound to accept or make the same offer on his part, or the whole is considered as confessed by him.
3 Bl. Comm. 342.