(1):

(v. i.) To assert; to aver; to declare.

(2):

(v. t.) To warrant; to maintain by affirmations; to attest; to affirm; to avouch.

(3):

(n.) Warrant; attestation.

(4):

(v. t.) To call; to summon.

(5):

(v. i.) To bear witness; to give testimony or full attestation.

(6):

(v. t.) To call into court to warrant and defend, or to make good a warranty of title.

(7):

(v. t.) To back; to support; to confirm; to establish.

(8):

(v. t.) To call upon to witness; to obtest.