Asseverate (&unr_;), v. t. [imp. & p. p. Asseverated (&unr_;); p. pr. & vb. n. Asseverating (&unr_;).] [L. asseveratus, p. p. of asseverare to assert seriously or earnestly; ad + severus. See Severe.] To affirm or aver positively, or with solemnity.
[1913 Webster]

Syn. -- To affirm; aver; protest; declare. See Affirm.
[1913 Webster]