What is Verify?

Legal Definition
To confirm or substantiate by oath; to show to be true. Particularly used of making formal oath to accounts, petitions, pleadings, and other papers. The word "verify" sometimes means to confirm and substantiate by oath, and some-times by argument When used in legal proceedings it is generally employed in the former sense. De Witt v. Hosmer, 3 How. Prae. (N. Y.) 284.
-- Black's Law Dictionary