Juris et de jure
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Of law and of right. A presumption juris et de jure, or an irrebuttable presumption, is one which the law will not suffer to be rebutted by any counter-evidence, but establishes as conclusive ; while a presumption juris tantum is one which holds good in the absence of evidence to the contrary, but may be rebutted.