aver

A work horse, or working ox. [Obs. or Dial. Eng.] 1. To assert, or prove, the truth of. [Obs.] 2. (Law) To avouch or verify; to offer to verify; to prove or justify. See Averment. 3. To affirm with confidence; to declare in a positive manner, as in confidence of asserting the truth. It is sufficient that the very fact hath its foundation in truth, as I do seriously aver is the case. Fielding. Then all averred I had killed the bird. Coleridge. Syn. -- To assert; affirm; asseverate. See Affirm.

Source: Webster's Revised Unabridged Dictionary (1913), United States public domain. See methodology for full licensing detail. Word validity for game play may differ from any official game dictionary.