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.
[ eccl.L f. Gk aion age ]