[mod. ad. L. chiliarchēs, -archus, a. Gr. χιλιάρχης, -ος, f. χίλιοι + ἀρχός ruler, f. ἄρχ-ειν to rule. In mod.Fr. chiliarque.] The commander of a thousand men; properly a term of Greek or Roman History.
1656. Blount, Glossogr., Chiliarch, a Collonel, Captain, or Commander of a thousand men.
1788. Gibbon, Decl. & F. (1802), VI. xxxiii. 15. Appointing eighty chiliarchs, or commanders of thousands.
1879. C. Geikie, Christ, lx. 742. The chiliarch in command of the garrison.