For other uses, see Epiphany. An epiphany (from the ancient Greek ἐπιφάνεια, epiphaneia, manifestation, striking appearance) is an experience of sudden and striking realization.or other uses, see Epiphany. An epiphany (from the ancient Greek ἐπιφάνεια, epiphaneia, manifestation, striking appearance) is an experience of sudden and striking realization.