Cambio, cambis, campsi & cambiui, cambîre. Prilcian. To chaunge: in olde time it signified to sight: to beginue a iourney.
Lewis and Short: Latin dictionary
cambio, īre, v. n. (perf. campsi, acc. to Charis. pp. 219 and 233 P., and Prisc. p. 906 ib.) [whence the Ital. and mercantile cambio, cambiare, cambiatura, etc.; Fr. change, changer, etc.; Engl. change, etc.], to exchange, barter: muto, a)mei/bomai, Charis. l.l. (post-class. and very rare), App. Mag. p. 284; Sicul. Flacc. Cond. Agr. p. 13 Goes.