affirmo

ad-fīrmō (aff-) āvī, ātus, āre,

to strengthen.— Fig., to confirm, encourage: Troianis spem, L.— Meton., to confirm, maintain, aver, positively assert, give solemn assurance of: nihil: rem pro certo, L.: se plus non daturam: Cornelium id bellum gessisse, L.: de altero: ut adfirmatur, Ta.