Lewis & Short

millēni, ae, a, adj. num. distr. [mille], a thousand each, a thousand (post-class.; for mille numero is the true reading, Plaut. Bacch. 4, 9, 4), Gal. Inst. 2, 225; Dig. 31, 89, 1; Lampr. Heliog. 21, 7; 26, 7; Vulg. Num. 31, 5; id. 2 Reg. 18, 4; id. 1 Esdr. 8, 27.