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

    From the beginning. See 1 Bl. Comm. 440.

  • Black's Law Dictionary: 2nd Edition

    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.