theophany

n. appearance of God or a god to a person; manifestation of Gos on earth

From the Greek, theo (God), and phainein (to show forth), theophany means an appearance of a God to man, or a divine disclosure. While the Iliad is our earliest source for descriptions of theopanies in the Classical tradition (and they occur throughout Greek mythology), probably the earliest description of a theophany is in the Epic of Gilgamesh. There, the protagonist meets Siduri, a goddess associated with brewing and fermentation. In the Judeo-Christian tradition, the Bible is the primary source of events which both Britannica and the New Catholic Encyclopedia cite as being theophanies.
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Noun
1. a visible (but not necessarily material) manifestation of a deity to a human person
(hypernym) manifestation

(n.)
A manifestation of God to man by actual appearance, usually as an incarnation.
  

Theophany [from Greek theophaneia from theos god + phainesthai to appear] The appearance of a god; a degree in the ancient Mysteries, where the candidate was illumined by his own inner god, and differing from epiphany in being of a more lasting nature. In Christian ecclesiasticism, used for the incarnation of the Christos. In the outer or Lesser Mysteries it meant the showing of representations of the gods to the people -- as at the festivals held at Delphi. See also THEOPATHY; THEOPNEUSTY