su·per·sti·tion 
(s′pər-stĭshən)
(s′pər-stĭshən)n.
1. An irrational belief that an object, action, or circumstance not logically related to a course of events influences its outcome.
2.
a. A belief, practice, or rite irrationally maintained by ignorance of the laws of nature or by faith in magic or chance.
b. A fearful or abject state of mind resulting from such ignorance or irrationality.
c. Idolatry.
[Middle English supersticion, from Old French superstition, from Latin superstitiō, superstitiōn-, from superstes, superstit-, standing over; see stā- in the Appendix of Indo-European roots.]