the.com/epiphany

means a sudden, often startling moment of clear understanding or revelation, when the meaning of something becomes obvious all at once.

from From Greek 'epiphaneia,' a 'manifestation' or 'appearing,' built from 'epi-' (upon) and 'phainein' (to show, to bring to light) — the same root that glows in 'phantom' and 'phenomenon.' It first named the showing-forth of a god, and Christianity borrowed it for the feast of Epiphany, when the Magi saw the Christ child revealed. Only later did the word step out of church and into the everyday mind, where any small revelation could feel briefly divine.