The term epiphany is used to refer to a moment in which a person comes to a sudden realization or when he comes to a intuitive understanding regarding something. It can also be that something has been revealed to him in that moment.
The word comes from the Greek word ‘epiphainein’ which means ‘manifestation, striking appearance’. Hence, when someone comes to a realization regarding something, or has had something suddenly revealed to him.
An example of an epiphany would be when the apple fell on Sir Issac Newton’s head and he suddenly came to a realization and understanding of gravity. An epiphany is also commonly called the ‘Aha’ moment or the ‘Eureka!’ moment.
The term ‘epiphany’ is also used to indicate the manifestation of Christ to the Gentiles as represented by the Magi. Christ appeared suddenly to the gentiles, and in a moment of great revelation. Hence, the term is now commonly used to refer to a moment of sudden and great revelation or realization.
Epiphany is also a Christian feast that celebrates the manifestation of the divine nature of Jesus Christ to the Gentiles. This feast is traditionally observed on January 6.