χιλίαρχος (in Hdt., al., -ης), -ου, ὁ
(χίλιοι, ἄρχω) [in LXX chiefly for אַלּוּף שַׂר ;]
a chiliarch, the commander of a thousand, esp. a Roman military tribune, the commander of a cohort: Jhn.18:12, Act.21:31-33, 37 22:24-29 23:10, 15 23:17-19, 22 24:7, 22 25:23; more generally, of officers of similar rank, Mrk.6:21, Rev.6:15 19:18 (see, DB, i, 352b; DCG, i, 271a, 307a).†
(AS)