Lex datraisnia
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The proof of a thing which one denies to be done by him, where another affirms it; defeating the assertion of his adversary, and showing it be against reason or probability. This was used among the old Romans, as well as the Normans. Cowell.
Defined under Lex in Black's Law Dictionary.