epiphany
US /ɪˈpɪf.ən.i/
UK /ɪˈpɪf.ən.i/

1.
a moment of sudden and great revelation or realization
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He had an epiphany while meditating, realizing the true meaning of life.
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The discovery of the new evidence was an epiphany for the detective.
2.
(in the Christian Church) the manifestation of Christ to the Gentiles as represented by the Magi (Matthew 2:1–12).
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Christians celebrate Epiphany on January 6th.
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The Feast of the Epiphany commemorates the visit of the Magi to the infant Jesus.