King James Bible
King James Version (KJV)

A primitive root, apparently meaning to mediate in religious services; but used only as denominative from kohen; to officiate as a priest; figuratively, to put on regalia -- deck, be (do the office of a, execute the, minister in the) priest('s office).
see HEBREW kohen
H3547. kahan
II. [כָּהַן] verb only
Pi`el denominative act as priest; — Perfect כִּהֵן Exodus 40:13; 1 Chronicles 5:36; 3masculine plural כִּהֲנוּ 28:41; 40:15; Imperfect3masculine singular יְכַהֵן Numbers 3:4 2t.; plural יְכַהֲנוּ 1 Chronicles 24:2; Infinitive construct כַּהֵן Exodus 29:1 11t.; suffix כַּהֲנוֺ 28:1, 3, 4. —
1 minister as a priest, absolute Exodus 31:10; 35:19; 39:41; Leviticus 16:32; Numbers 3:3-4, (all P); ׳כ לִי minister to me (׳י) Exodus 28:1, 3, 4, 41; 29:1, 44; 30:30; 40:13, 15 (all P), Ezekiel 44:13; Hosea 4:6; ׳כ ליהוה Leviticus 7:35 (P), 1 Chronicles 5:36; 1 Chronicles 24:2; 2 Chronicles 11:14 (always of Aaron and his sons, except Ezekiel 44:13; 2 Chronicles 11:14, where Levites are forbidden to minister; and Hosea 4:6 of Israel, whose national priesthood is taken away).
2 be or become priest Deuteronomy 10:6 (E ?).
3 play the priest: מְּאֵר יְכַהֵן כֶּחָתָן Isaiah 61:10 as a bridegroom (that) priests it with his turban, decks himself with a splendid turban such as the priests wore.