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asseverateuh-SEV-uh-rayt , transitive verb; 1.To affirm or declare positively or earnestly.

Quotes:
But of course it is! asseverates Herman Woodlife.
— Miles Kington, “Child slavery: the half-truth”, Independent, June 12, 1998

Castro’s been known to snow people, but he didn’t snow me, Mr. Weicker asseverated.
— “Fading Fidel and his gulled groupies”, Washington Times, July 6, 2001

Mr. Vidal asseverates that McVeigh is “very, very bright.” He writes with “perfect” spelling, punctuation and grammar.
— R. Emmett Tyrrell Jr., “When grim opportunity knocks . . .”, Washington Times, May 11, 2001
Origin:

Asseverate comes from Latin asseverare, “to assert seriously or earnestly,” from ad- + severus, “severe, serious.”
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