Lexical Definition

‎ἀρχιερεύς‎ archiereús (ar-khee-er-yuce') high-priest ^G:N-M
from ‎ἀρχή‎ and ‎ἱερεύς‎

chief (high) priest, chief of the priests.

• the high-priest (literally, of the Jews, typically, Christ)
• by extension a chief priest

Abbott-Smith

ἀρχ-ιερεύς, -έως, ὁ, [in LXX for כֹּהֵן, הַגָּדוֹל כּ״, הָרֹאשׁ כּ״;]

1. high-priest: Mk 2:26 14:47, al.; of Christ: He 2:17 3:1, al.
2. In pl., chief priests, including ex-high-priests and members of high-priestly families: Mt 2:4, Mk 8:31, al. (Cremer, 294; DCG, i, 297 f.; MM, s.v.).

Abbott-Smith References

Liddell-Scott-Jones

ἀρχιερεύς-εύς, έως, ὁ:

Ionic dialect ἀρχῐέρεως, εω, [Refs 5th c.BC+]:— arch-priest, chief-priest, [same places], frequently in Inscrr., νήσου[Refs 1st c.AD+], etc.:—at Rome, = pontifex, [Refs 1st c.AD+]; ἀ. μέγιστος, = pontifex maximus, [Refs]:—at Jerusalem, high-priest, [LXX+NT]

_{LSJ Scripture Refs: LXX.Lev.4.3 ☩ Matt.26.3}