(adjective) : dĕcĭmānus or dĕcŭmānus (v. decimus), a, um, decimus
* Of or belonging to the tenth part.
* Prop.
* Of tithes, as a tax: ager,that pays tithes,Cic. Verr. 2, 3, 6; cf.: frumentum,i. e. a tithe of the produce,id. ib. 2, 3, 5fin. and 81: oleum, Lucil. ap. Non. 445, 19.
* Meton., considerable, large, immense (cf.: decimus, decem, decies, etc.): accipensere, Lucil. ap. Cic. Fin. 2, 8, 24: DECUMANA ova' dicuntur et DECUMANI fluctus, quia sunt magna, Paul. ex Fest. p. 71, 5; cf. ib. 4, 7 Müll.
* Of the tenth cohort: miles, Auct. B. Afr. 16, 2; and oftener absol.dĕcŭmāni, ōrum, m., id. ib. § 1; Auct. B. Hisp. 30 fin.; Tac. H. 5, 20; Suet. Caes. 70.—Esp.: porta decumana, the main entrance of a Roman camp, placed the farthest from the enemy (because the tenth cohort of each legion was there encamped), opposite the porta praetoria, Caes. B. G. 2, 24; 3, 25 fin.; 6, 37; id. B. C. 3, 69; Liv. 3, 5; 10, 32 fin. al.; cf. Veg. Mil. 1, 23; Smith's Ant. p. 222, a.
* Decumanus limes, in agriculture, a boundary line drawn from east to west, opp. cardo (v. h. v.), Col. 12, 43, 2; Plin. 17, 22, 35, § 169; 18, 34, 77, § 337; cf. Paul. ex Fest. p. 71, 14; v. Wordswörth, Fragm. p. 446.

s. TLL