Entry 4 senses · 2 variants Webster, 1913 Aver /(ā"vẽr)/ · A·ver · IPA /əˈvɝ/ n. v. t. 01 n. A work horse, or working ox. 1. A work horse, or working ox.[Obs. or Dial. Eng.] 02 v. t. To assert, or prove, the truth of. imp. & p. p. Averred; p. pr. & vb. n. Averring 1. To assert, or prove, the truth of.[Obs.] 2. To avouch or verify; to offer to verify; to prove or justify. See Averment.(Law) 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.