(1):

(v. t.) To confirm; to make certain or secure.

(2):

(v. t.) To insure; to covenant to indemnify for loss, or to pay a specified sum at death. See Insure.

(3):

(v. t.) To make sure or certain; to render confident by a promise, declaration, or other evidence.

(4):

(v. t.) To declare to, solemnly; to assert to (any one) with the design of inspiring belief or confidence.

(5):

(v. t.) To affiance; to betroth.