The Collaborative International Dictionary of English v.0.48:

Theophany \The*oph"a*ny\, n.; pl. -nies. [Gr. ?; ? God + ? to
   appear.]
   A manifestation of God to man by actual appearance, usually
   as an incarnation.
   [1913 Webster]
   [1913 Webster]

WordNet (r) 3.0 (2006):

theophany
    n 1: a visible (but not necessarily material) manifestation of a
         deity to a human person

Moby Thesaurus II by Grady Ward, 1.0:

99 Moby Thesaurus words for "theophany":
   Christophany, Masan, Satanophany, afflatus, angelophany,
   apocalypse, apparition, appearance, appearing, arising, astral,
   astral spirit, avatar, banshee, coming, coming into being,
   coming-forth, control, departed spirit, direct communication,
   disclosure, disembodied spirit, dissemination, divine inspiration,
   divine revelation, duppy, dybbuk, eidolon, embodiment, emergence,
   epiphany, evidence, evincement, exposure, expression, form,
   forthcoming, ghost, grateful dead, guide, hant, haunt, idolum,
   immateriality, incarnation, incorporeal, incorporeal being,
   incorporeity, indication, inspiration, issuance, larva, lemures,
   manes, manifestation, materialization, materializing,
   mystical experience, mysticism, occurrence, oni, opening, phantasm,
   phantasma, phantom, pneumatophany, poltergeist, presence,
   presentation, proof, prophecy, publication, realization,
   revelation, revenant, rise, rising, shade, shadow, shape, showing,
   showing forth, shrouded spirit, specter, spectral ghost, spirit,
   spook, sprite, theophania, theopneustia, theopneusty, unfolding,
   unfoldment, unsubstantiality, vision, walking dead man,
   wandering soul, wraith, zombie