A false belief unexplained by reality share by a number of people

 A superstition is any belief or practice considered by non-practitioners to be irrational or supernatural, attributed to fate or magic, perceived supernatural influence, or fear of that which is unknown.

Key Points

• Superstition is commonly applied to beliefs and practices surrounding luck, amulets, astrology, fortune telling, spirits, and certain paranormal entities, particularly the belief that future events can be foretold by specific (apparently) unrelated prior events.
• Superstition is a false belief, unexplained by reality & shared by a number of people.
• Also, the word superstition is often used to refer to a religion not practiced by the majority of a given society regardless of whether the prevailing religion contains alleged superstitions or to all religions by the antireligious.
• Religious practices that differ from commonly accepted religions in a given culture are sometimes called superstitious.
• Similarly, new practices brought into an established religious community can also be labeled as superstitious in an attempt to exclude them.
• Similarly, an excessive display of devoutness has often been labeled as superstitious behavior.

Thus, it is concluded that the false belief unexplained by reality shared by a number of people is superstition.