occult (adj.)

1530s, "secret, not divulged," from French occulte and directly from Latin occultus "hidden, concealed, secret," past participle of occulere "cover over, conceal," from assimilated form of ob "over" (see ob-) + a verb related to celare "to hide" (from PIE root *kel- (1) "to cover, conceal, save"). Meaning "not apprehended by the mind, beyond the range of understanding" is from 1540s. The association with the supernatural sciences (magic, alchemy, astrology, etc.) dates from 1630s. A verb occult "to keep secret, conceal" (c.1500, from Latin occultare) is obsolete.

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Definitions of occult from WordNet
occult (v.)
cause an eclipse of (a celestial body) by intervention;
Planets and stars often are occulted by other celestial bodies
Synonyms: eclipse
occult (v.)
become concealed or hidden from view or have its light extinguished;
The beam of light occults every so often
occult (v.)
hide from view;
The lids were occulting her eyes
occult (n.)
supernatural forces and events and beings collectively;
Synonyms: supernatural
occult (n.)
supernatural practices and techniques;
he is a student of the occult
Synonyms: occult arts
occult (adj.)
hidden and difficult to see;
occult blood in the stool
an occult fracture
occult (adj.)
having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding;
occult lore