Webster's Revised Unabridged Dictionary · 1913

Eon

Eon , noun

[Latin aeon, from Greek a'iwn space or period of time, lifetime, age; akin to Latin aevum. See Age.]

1.
An immeasurable or infinite space of time; eternity; a long space of time; an age.
The eons of geological time. — Huxley
2.
(Gnostic Philosophy) One of the embodiments of the divine attributes of the Eternal Being.
Among the higher aons are Mind, Reason, Power, Truth, and Life. — Am. Cyc

Eons were considered to be emanations sent forth by God from the depths of His grand solitude to fulfill various functions in the material and spiritual universe.

Also: aeon