From Latin ("august"); Augustus, a title of the Roman emperor -- Augustus.
Thayer's Greek Lexicon
Strong's 828: Αὐγοῦστος
Αὐγοῦστος, Ἀυγυστου, ὁ, Augustus (cf. English Majesty; see σεβαστός, 2), the surname of Gaius Julius Caesar Octavianus, the first Roman emperor: Luke 2:1.
Luke 2:1 - N-GMS GRK:παρὰ Καίσαρος Αὐγούστου ἀπογράφεσθαι πᾶσαν NAS: out from Caesar Augustus, that a census be taken KJV: Caesar Augustus, that all INT: from Ceasar Augustus that should be registered all