superstition

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superstition,

an irrational belief or practice resulting from ignorance or fear of the unknown. The validity of superstitions is based on belief in the power of magic and witchcraft and in such invisible forces as spirits and demons. A common superstition in the Middle Ages was that the devil could enter a person during that unguarded moment when that person was sneezing; this could be avoided if anyone present immediately appealed to the name of God. The tradition of saying "God bless you" when someone sneezes still remains today.
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superstition

1. irrational belief usually founded on ignorance or fear and characterized by obsessive reverence for omens, charms, etc.
2. a notion, act or ritual that derives from such belief
3. any irrational belief, esp with regard to the unknown
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005