beginning, corner, (at the, the) first (estate), magistrate, power, principality, principle, rule

Boyd’s Bible Dictionary:

(standing). In Mark 6:21, a class or order representing the government. The “estate of the elders,” Acts 22:5, was a body of advisers cooperating with the Sanhedrim.

Strong’s Dictionary of Greek Words:

Number:

746 (find all occurrences in KJV Bible)

Greek:

ἀρχή

Transliteration:

arche

Phonic:

ar-khay’

Meaning:

from 756; (properly abstract) a commencement, or (concretely) chief (in various applications of order, time, place, or rank)

KJV Usage:

beginning, corner, (at the, the) first (estate), magistrate, power, principality, principle, rule