GNU Collaborative International Dictionary of English

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1.       
   Asseverate , v. t. [imp. & p. p. Asseverated ; p. pr. & vb. n. Asseverating .] [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