Quick Definition
ἱερατεύω v. I serve as priest
Strong's Definition
prolongation from 2409; to be a priest, i.e. perform his functions
KJV Usage: execute the priest's office
UBS Dictionary of the Greek New Testament
verb | ἀρχιερατικός · ἀρχιερεύς · ἱερατεία · ἱεράτευμα · ἱερεύς · ἱερόθυτος · ἱερόν · ἱεροπρεπής · ἱερός · ἱεροσυλέω · ἱερουργέω · ἱερωσύνη
53.85 · Religious Activities · Roles and Functions
to serve as a priest, to be a priest to serve as a priest in the performance of religious rites and duties In contrast with the prophet who speaks to people on behalf of God, the priest is often defined as one who represents the people before God. In reality, however, the priest is one who is primarily engaged in religious ritual and ceremony in contrast with the prophet, whose primary activity is involved in proclaiming a message. In societies in which there is no organized priesthood and where there are only medicine men or shamans, it has often been possible to translate ἱερουργέω and ἱερατεύω as simply ‘to be God’s shaman.’ Whether such an expression can be used depends very largely upon the connotations associated with shamanism.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἱερατεύω ; (fr. ἱεράομαι and the verbal adj. ἱερατός, though this adj. does not occur) ; to be priest, discharge the priest’s office, be busied in sacred duties: Lk. i. 8. (Joseph. antt. 3, 8,1; Hdian. 5, 6, 6 [8 ed. Bekk.]; Pausan., Heliod., Inscrr. [see L. and 5.1; Sept. for 1773.) * ‘Teperx, see Ἱεριχώ.
Mounce Concise Greek Dictionary
ἱερατεύω hierateuō 1x
to officiate as a priest, perform sacred rites, Lk. 1:8*
Abbott-Smith Greek Lexicon
ἱερατεύω
(cl. = ἱεράομαι), [in LXX chiefly for כּהן pi.;]
to be a priest, officiate as a priest: Lk 1:8 (the word is freq. in Inscr.; v. LS, s.v.; Deiss., BS, 215; LAE, 70; Cremer, 734).†
Liddell-Scott-Jones — Greek-English Lexicon
ἱερατεύω (hierateuō) — to serve as priest. ἱερᾱτ-εύω, Ionic dialect ἱερητ- [Refs] (later also in Northern Greece, Boeotian dialect, [Refs 6th c.BC+]; Lesb. ἰρητεύω [Refs]:—to be priest or priestess, θεῶν [Refs 2nd c.BC+]; τοῦ Διὸς τοῦ Σωτῆρος [NT+4th c.BC+]:—also ἱερᾱτ-εύομαι, [Refs]
II. passive, to be made holy, Zos.Alch.p.108B.