Ubi Eadem Ratio, Ibi Eadem Lex Law and Legal Definition

Ubi eadem ratio, ibi eadem lex is a legal maxim in Latin. The principle states that, where the same reason exists, there the same law prevails.

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

In all actions of tort it was never questioned but the plaintiff could join several, and recover against one or more of them; hence it was always held that, in such actions, defendants could sever their pleas. Ubi eadem ratio, ibi eadem lex. [Austin v. Feland, Graves & Graves, 8 Mo. 309 (Mo. 1843)].