superstition su·per·sti·tion [soo-per-stish-uhn] noun1.a belief or notion, not based on reason or knowledge, in or ofthe 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, especially inconnection with religion.5.any blindly accepted belief or notion