Occultism (noun)

1. The study or belief in supernatural or mystical powers, practices, or phenomena.
2. The belief in or study of hidden knowledge or spiritual truths.

Origin:

From the latin word occultus, meaning "hidden" or "secret", from occulere, meaning "to conceal".

Examples:

1. The occultism of the ancient Egyptians included the belief in magic and the afterlife.
2. He was interested in the occultism of the Middle Ages, including alchemy and astrology.
3. The occultism of the 19th century included spiritualism and Theosophy.
4. She was a practitioner of occultism, believing in the power of magic spells and rituals.
5. Many occultism practices have been discredited as pseudoscience or superstition.