Acco Save Lewis & Short Gaffiot 2016 Acco, ōnis, m., a chieftain of the Senones, Caes. B. G. 6, 4; 44 al. Accō, (14) ōnis, m. , nom dʼun personnage gaulois : Cæs. G. 6, 4, 1 ; 6, 44, 2 ; 7, 1, 4.