Affirmátio, Verbale. Cic.An affirmation.Affirmatio & Dubitatio contraria.Cic.Affirmatione alicuius credere. Plancus. Ciceroni. To beleeue it at ones affirming.Affirmatione aliquid alteri recipere. Plancus. Cicer.To promise a thing affuredly.
Lewis and Short: Latin dictionary
affirmātĭo (adf-), ōnis, f. [affirmo], an affirmation, declaration, confirmation, or averment of a fact or assertion: est enim jus jurandum adfirmatio religiosa, Cic. Off. 3, 29; so Planc. ap. Cic. Fam. 10, 21, and Cic. ib. 7: in spem venire alicujus adfirmatione de aliqua re, Caes. B. G. 7, 30: constantissima annalium adfirmatione, Plin. 28, 2, 4, 15; multā abfirmatione abnuere, Curt. 6, 11.