superstition defined…

According to a superstition is:

1.  a belief or notion, not based on reason or knowledge, in or of the ominous significance of a particular thing, circumstance, occurrence, proceeding, or the like.

2. a system or collection of such beliefs.

3. a custom or act based on such a belief.

4. irrational fear of what is unknown or mysterious, esp. in connection with religion.

5. any blindly accepted belief or notion.