Ac Si
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
(Lat. As if.) Townsh.
PI. 23, 27.
These words frequently occur in old English statutes. Lord Bacon expounds their meaning in the statute of uses: "The statute gives entry, not simpliciter, but with an ac si." Ban. Read. Uses, Works, iv.
195.