G2405–ἱερατεία–hierateia

According to the custom of the priests' office, his lot was to burn incense when he went into the temple of the Lord.

ἱερατείας hi'erateias “priesthood”

And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes from the people according to the law, that is, from their brethren, though they come from the loins of Abraham:

ἱερατείαν hi'erateian “priestly office”