Aver

Webster's Dictionary of the English Language

·noun A work horse, or working ox.

II. Aver ·vt To assert, or prove, the truth of.

III. Aver ·vt To avouch or verify; to offer to verify; to prove or justify. ·see Averment.

IV. Aver ·vt To affirm with confidence; to declare in a positive manner, as in confidence of asserting the truth.