n. (also eon)
1. a very long or indefinite period.
2 an age of the universe.
3 Astron. a thousand million years.
4 an eternity.
5 Philos. (in Neoplatonism, Platonism, and Gnosticism) a power existing from eternity, an emanation or phase of the supreme deity.
Etymology: eccl.L f. Gk aion age