Strong's #4575: sebastos (pronounced seb-as-tos')

from 4573; venerable (august), i.e. (as noun) a title of the Roman Emperor, or (as adjective) imperial:--Augustus(-').

Thayer's Greek Lexicon:

́

sebastos

1) reverend, venerable

2) the title of the Roman emperors

2a) Augustan, i,e, taking its name from the emperor

2b) a title of honour which used to be given certain legions, or cohorts, or battalions, "for valour"

Part of Speech: adjective

Relation: from G4573

Citing in TDNT: 7:174, 1010

Usage:

This word is used 3 times:

 

Acts 25:21: "unto the hearing of Augustus, I commanded him to be kept till"
Acts 25:25: "himself hath appealed to Augustus, I have determined to send him."
Acts 27:1: "unto one named Julius, a centurion of Augustus' band."