adjective

1. hidden; concealed
2. secret; esoteric
3. beyond human understanding; mysterious
4. designating or of certain arts, studies, or practices, as magic, alchemy, or astrology, involving mysterious powers that some people believe can affect the way things happen

Etymology: L occultus, concealed, pp. of occulere, to cover over < ob- (see ob-) + celare, to hide (see hall)

transitive verb, intransitive verb

1. to hide or become hidden from view
2. Astron. to hide by occultation