From the beginning of the world.
Definition of Ab Initio Mundi
Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
-
Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd EditionLat. From the beginning of the world. Ab initio mundi usque ad hodiernum diem, from the beginning of the world to this day. Y. B. M. 1 Edw. III.