OCCULT', adjective [Latin occultus, occulo; ob and celo, to conceal.] Hidden from the eye or understanding; invisible; secret; unknown; undiscovered; undetected; as the occult qualities of matter. The occult sciences are magic, necromancy, etc. OCCULT lines, in geometry, are such as are drawn with the compasses or a pencil, and are scarcely visible.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI