Lewis & Short

arcĭfīnālis, e, or arcĭfīnĭus, a, um, adj. [arceo-finis]; among surveyors, agri, lands received in possession and built upon by victors after expelling the previous owners (whence the term), Sic. Fl. p. 3; Front. p. 38; Hyg Lim. p. 160. Defined otherwise by Isid. Orig. 15, 13.