Oc-cult - 1. of or pertaining to magic, astrology, or any system claiming use or knowledge of secret or supernatural powers or agencies. 2. beyond the range of ordinary knowledge or understanding; mysterious. 3. secret; disclosed or communicated only to the initiated. 4. hidden from view. 5. (in early science) a. not apparent on mere inspection but discoverable by experimentation. b. of a nature not understood, as physical qualities. c. dealing with such qualities; experimental: occult science.