What is Ad Ea Quae Frequentius Accidunt Jura Adaptantur?

Legal Definition
Laws are adapted to those cases which most frequently occur. 2 Inst. 137; Broom, Max. 48. Laws are adapted to cases which frequently occur. A statute, which, construed according to its plain words, is, in nil cases of ordinary occurrence, in no degree inconsistent or unreasonable, should not be varied by construction in every case, merely because there is one possible but highly improbable case in which the law would operate with great severity and against our notions of justice. The utmost that can be contended is that the construction of the statute should be varied in that particular case, so as to obviate the injustice. 7 Exchi 549; 8 Exch. 778.
-- Black's Law Dictionary
Legal Definition
Laws are adapted to those cases which more commonly occur.
-- Ballentine's Law Dictionary