From the beginning. See 1 Bl. Comm. 440.
Definition of Ab Initio
Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd EditionLat 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.