probably from a primary verb eiro (to join); peace (literally or figuratively); by implication, prosperity:--one, peace, quietness, rest, + set at one again.
a state of national tranquillity
exemption from the rage and havoc of war
peace between individuals, i.e. harmony, concord
security, safety, prosperity, felicity, (because peace and harmony make and keep things safe and prosperous)
of the Messiah's peace
the way that leads to peace (salvation)
of Christianity, the tranquil state of a soul assured of its salvation through Christ, and so fearing nothing from God and content with its earthly lot, of whatsoever sort that is
the blessed state of devout and upright men after death