Lewis & Short

dēdĭtīcĭus or -tĭus, a, um, adj. [deditio], belonging to a surrender or capitulation; and subst. dediticius, ii, m., one who has surrendered or capitulated, a captive: quicquid deinde patiemur, dediticii vestri passuri, Liv. 7, 31; cf. Gai. Inst. 1, 14; Isid. Orig. 9, 4, 49; so Caes. B. G. 1, 27, 4; 2, 17; Sall. J. 31, 19; Liv. 7, 38 al.
According to a decree of the Lex Aelia Sentia (A. U. C. 757), slaves who had suffered an infamous punishment were to be by manumission only dediticiorum numero, Gai. Inst. 1, 13 and 15; Just. Inst. 1, 5, 3; Sanders ad loc.