Ab Initio
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Lat From the beginning; from the first act. A party is said to be a trespasser ab initio, an estate to be good ab initio, an agreement or deed to be void ab initio, a marriage to be unlawful ab initio, and the like.
Plow. 6a, 16a; 1 BL Comm. 440.