The Collaborative International Dictionary of English v.0.48:
Aver \A*ver"\ ([.a]*v[~e]r"), v. t. [imp. & p. p. Averred
([.a]*v[~e]rd"); p. pr. & vb. n. Averring.] [F. av['e]rer,
LL. adverare, averare; L. ad + versus true. See Verity.]
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
Then all averred I had killed the bird. --Coleridge.
Syn: To assert; affirm; asseverate. See Affirm.