Quaelibet Concessio Fortissime Contra Donatorem Interpretanda Est Law and Legal Definition

Quaelibet concessio fortissime contra donatorem interpretanda est is a legal maxim in Latin. This maxim states that every grant is to be interpreted or construed most strictly against the grantor.

The following is an example of a case law referring to the maxim:

If there is any doubt as to the construction of the guaranty, it is to be taken most strongly against the guarantor, as was held in the case of Mason v. Pritchard, 12 East, 227, according to the legal maxim that a man's grant shall be construed most strongly against himself. Quaelibet concessio fortissime contra donatorem interpretanda est. [Courtis v. Dennis, 48 Mass. 510, 516 (Mass. 1844)].