1: ἑκατοντάρχης
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(Strong's #1543 — Noun Masculine — hekatontarchos — hek-at-on-tar'-khace, hek-at-on-tar'-khos )

"a centurion," denotes a military officer commanding from 50 to 100 men, according to the size of the legion of which it was a part (hekaton, "a hundred," archo, "to rule"), e.g., Matthew 8:5,8 .

2: ἑκατοντάρχης
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(Strong's #1543 — Noun Masculine — hekatontarches — hek-at-on-tar'-khace, hek-at-on-tar'-khos )

has the same meaning as No. 1, e.g., Acts 10:1,22 . The Sept. has this word frequently, to denote "captains of hundreds."

3: κεντυρίων
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(Strong's #2760 — Noun Masculine — kenturion — ken-too-ree'-ohn )

is a Greek transliteration of the Latin centurio, signifying practically the same as No. 1, Mark 15:39,44,45 . There were ten "centurions" to a cohort when the numbers were complete. There were several at Jerusalem under the chief captain mentioned in Acts 21:31 .