from a compound of ἐκ and a derivative of καλέω; a calling out, i.e. (concretely) a popular meeting, especially a religious congregation (Jewish synagogue, or Christian community of members on earth or saints in heaven or both):--assembly, church.
from ἄρχομαι; (properly abstract) a commencement, or (concretely) chief (in various applications of order, time, place, or rank):--beginning, corner, (at the, the) first (estate), magistrate, power, principality, principle, rule.