a belief or practice resulting from ignorance, fear of the unknown, trust in magic or chance, or a false conception of causation b: an irrational abject attitude of mind toward the supernatural, nature, or God resulting from superstition
Several theories have been proposed about the origin of the Friday the 13th superstition.
One theory states that it is a modern amalgamation of two older superstitions: that thirteen is an unlucky number and that Friday is an unlucky day.
In numerology, the number twelve is considered the number of completeness, as reflected in the twelve months of the year, twelve hours of the clock, twelve gods of Olympus, twelve tribes of Israel, twelve Apostles of Jesus, the 12 successors of Muhammad in Shia Islam, etc., whereas the number thirteen was considered irregular, transgressing this completeness.
There is also a superstition, thought by some to derive from the Last Supper or a Norse myth, that having thirteen people seated at a table will result in the death of one of the diners.
Friday has been considered an unlucky day at least since the 14th century's "The Canterbury Tales", and many other professions have regarded Friday as an unlucky day to undertake journeys or begin new projects.
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