Superstition (noun)

1. A belief or practice resulting from ignorance, fear of the unknown, trust in magic or chance, or a false conception of causation.
2. An irrational belief in or fear of the supernatural.
3. An unfounded or irrational belief that an object, action, or circumstance not logically related to a course of events influences its outcome.

Origin:

From the latin word "superstitio" meaning excessive fear of the gods or undue reverence for religion.

Examples:

1. Many people believe that breaking a mirror brings seven years of bad luck, which is a superstition.
2. He had a superstition that carrying a rabbit's foot would bring him good luck.
3. Superstitions such as throwing salt over your shoulder or avoiding black cats are common.
4. Superstition can be dangerous, especially when it leads to practices that are harmful or illegal.
5. Some people consider astrology and fortune-telling as superstitions.