Assure

1. To make sure or certain; to render confident by a promise, declaration, or other evidence.
2. To declare to, solemnly; to assert to (any one) with the design of inspiring belief or confidence.
3. To confirm; to make certain or secure.
4. To affiance; to betroth.
5. (Law) To insure; to covenant to indemnify for loss, or to pay a specified sum at death. See Insure.