This term Æon (Αἰών) seems to have been formed from the words ἀεὶ ὤν, ever-existing. “We may take αἰών, therefore,” says Harvey (Irenæus, cxix.), “in the Valentinian acceptation of the word, to mean an emanation from the divine substance, subsisting co-ordinately and co-eternally with the Deity, the Pleroma still remaining one.”