Lewis Short
(adjective) : trĭbūtārĭus, a, um, tributum
* Of or belonging to tribute: necessitas,of paying tribute,Just. 32, 2, 1: solum,subject to tribute, tributary,Plin. 12, 1, 3, § 6; so, praedia tributaria sunt ea, quae in his provinciis sunt, quae propriae Caesaris esse creduntur (opp. stipendiaria),Gai. Inst. 2, 21: civitates,Just. 1, 7, 2: Thraces Macedonum,Flor. 3, 4, 1: tributarius Gallus quidam,Suet. Aug. 40: causa,concerning tribute,Dig. 49, 14, 46: tabellae,letters of credit,Cic. Verr. 2, 4, 66, § 148.
Charlton T. Lewis, Charles Short, A Latin Dictionary