Lewis & Short

fīdūcĭo, āvi, ātum, 1, v. a. [fiducia], to pledge, mortgage: EA CONDITIONE, NE FIDVCIENT, NE VENDANT, NEVE ALIO QVO GENERE ID SEPVLCRVM ALIENARE VLLA POTESTAS SIT, Inscr. Grut. 638, 4; id. Murat. 794, 1; cf. FIDVCIAT, ὑποτίθεται; FIDVCIATVS, ὑποτιθέμενος, Gloss. Philox.: sub pignoribus fiduciati, Tert. Idol. 23.