1. Hidden from the eye or the understanding; inviable; secret; concealed; unknown.
"It is of an occult kind, and is so insensible in its advances as to escape observation." -- I. Taylor.
(Geom.), a line drawn as a part of the construction of a figure or problem, but not to appear in the finished plan.
those qualities whose effects only were observed, but the nature and relations of whose productive agencies were undetermined; -- so called by the schoolmen.
those sciences of the Middle Ages which related to the supposed action or influence of occult qualities, or supernatural powers, as alchemy, magic, necromancy, and astrology.