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Affirmantis Est Probatio

Defined in 2 dictionaries — Cyclopedic (1922), Ballentine's (1916)

The Cyclopedic Law Dictionary

Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922

He who affirms must prove. 9 Cush, (Mass.) 535.

Ballentine's Law Dictionary

James A. Ballentine · 1916

The burden of proof is upon him who asserts.