G2405–ἱερατεία–hierateia

it fell to him by lot, according to the custom of the priesthood, to enter into the temple of the Lord to burn incense.

ἱερατείας hi'erateias “priesthood”

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

ἱερατείαν hi'erateian “priestly office”