From Greek Ἐπιφάνεια, Epiphaneia, "Manifestation", "striking appearance," also Theophany, Θεοφάνεια, "Vision of God."
In general use, the word epiphany has several primary uses:
1. a sudden realization or insight, the appearance of the divine
2. the revelation of the Solar Logos (Christ) within a purified and prepared human being; i.e. Christification, which happens after death and resurrection
3. the holy day (in early January, or in Spring) remembering those in whom the the Solar Logos manifested
"But is now made manifest by the ἐπιφάνεια epiphaneia of our Saviour Jesus Christ, who hath abolished death, and hath brought life and immortality to light..." —2 Timothy 1:10
"Epiphany is the manifestation, or the revelation, or the ascension of the Christ within us." —The Perfect Matrimony
"...epiphany: this old word comes from Greek. Epiphany is the ascension, revelation, or manifestation of Christ in us, after the resurrection of our Chrestos. This ascension takes us to the illumination of the Holy Spirit after having recapitulated our entire past within the profound abyss of evil. With epiphany we receive illumination, but during the forty days which precede the ascension, we sink into profound darkness." —The Seven Words