occult

Etymology

Borrowed from Latin occultus (“hidden, secret”).

verb

1. (transitive, astronomy) To cover or hide from view.
   The Earth occults the Moon during a lunar eclipse.
2. (transitive, rare) To dissimulate, conceal, or obfuscate.

adj

1. (medicine) Secret; hidden from general knowledge; undetected.
   occult blood loss; occult cancer
   This counter-influence is so much more conclusive[…] because it is of an occult kind, and is so insensible in its advances as to escape observation. 1860, Isaac Taylor, “Mind in Form”, in Ultimate Civilization, page 178
2. Related to the occult; pertaining to mysticism, magic, or astrology.
   Be aware that occult knowledge can be used for good or evil purposes. 2017, Pao Chang, Word Magic: The Powers & Occult Definitions of Words, →OCLC
3. Esoteric.

noun

1. (usually with "the") Supernatural affairs.