Abbott-Smith Manual Greek Lexicon
χιλίαρχος (G5506)
21 χιλίαρχος (in Hdt., al., -ης ), -ου, ὁ ( χίλιοι , ἄρχω ) [in LXX chiefly for אֶלֶף שַׂר ;] a chiliarch, the commander of a thousand , esp. a Roman military tribune, the commander of a cohort : Jo 18:12 , Ac 21:31-33 , 37 22:24-29 23:10 , 15 , 17-19 , 22 24:7 , 22 25:23 ; more generally, of officers of similar rank, Mk 6:21 , Re 6:15 19:18 (v., DB , i, 352 b ; DCG , i, 271 a , 307 a ).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain