G2407
ἱερατεύω
to serve as priest
ἱερατεύω (cl. = ἱεράομαι) [in LXX chiefly for כָּהַן pi. ;] to be a priest, officiate as a priest: Luk.1:8 (the word is frequently in Inscr.; see LS, see word; Deiss., BS, 215; LAE, 70; Cremer, 734).† (AS)
The KJV translates G2407 in the following manner:
office (2x)
Full Thayer's lexicon entry
ἱερατεύω — hierateúō
ἱερατεύω; (from ἱεράομαι and the verbal adjective ἱερατος, though this adjective does not occur); to be priest, discharge the priest's office, be busied in sacred duties: Luk 1:8. (Josephus, Antiquities 3, 8, 1; Herodian, 5, 6, 6 (3 edition, Bekker); Pausanias, Heliodorus, Inscriptions (see Liddell and Scott); the Sept. for כִּהֵן.)
1 occurrence