Vine's Expository Dictionary: View Entry
†χιλίαρχος chilíarchos, khil-ee'-ar-khos; from G5507 and G757; the commander of a thousand soldiers ("chiliarch"; i.e. colonel:—(chief, high) captain.
The KJV translates Strong's G5506 in the following manner: chief captain (19x), captain (2x), high captain (1x).
a chiliarch, the commander of a thousand soldiers
the commander of a Roman cohort (a military tribunal)
any military commander
Strong's Number G5506 matches the Greek χιλίαρχος (chiliarchos),
which occurs 22 times in 22 verses
in the TR Greek.