Epiphany, is a Christian "feast" celebrating the manifestation of the divine nature of Jesus to the Gentiles as represented by the Magi. This feast is traditionally observed on January 6.
Not all Christian denominations recognize or observe Epiphany.
More commonly used forms of the word "Epiphany":
A) A sudden manifestation of the essence or meaning of something.
B) A comprehension or perception of reality by means of a sudden intuitive realization:
"I experienced an epiphany, a spiritual flash that would change the way I viewed myself." (Frank Maier)