Lexical Definition

‎ἱερωσύνη‎ hierōsýnē (hee-er-o-soo'-nay) priesthood ^G:N-F
from ‎ἱερός‎

priesthood.

• sacredness, i.e. (by implication) the priestly office

Abbott-Smith

ἱερωσύνη, -ης, ἡ (< ἱερός), [in LXX: I Ch 29:22 (כּהן), I Es 5:38, Si 45:24, I Mac 2:54 3:49 7:9, 21, IV Mac 5:35 7:6*;]
priesthood: He 7:11, 12, 24.†

Abbott-Smith References

Liddell-Scott-Jones

ἱερωσύνη-ωσύνη,

in Attic dialect Inscrr. ἱερωσύνηεωσύνη [Refs 5th c.BC+]: ἡ:— priesthood, [ἱερωσύνηωσύνης μετασχεῖν 4th c.BC: Demosthenes Orator 59.92 ">Refs 5th c.BC+]: in plural, priestly services, sacrifices, [Refs 5th c.BC+]