Let's finish that definition.
Occult- of, relating to, or concerned with certain mystical arts or practices, as astrology or alchemy. 2. beyond the realm of human understanding; mysterious. 3. communicated only to the initiated; secret.
to conceal from view; hide. 4. Astronomy. to conceal by occultation. to become concealed from veiw.
( Latin occultus hidden, Occulere to cover up, hide)
What are they trying to hide?