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(usually prenominal)

1. coming after the twelfth in numbering or counting order, position, time, etc; being the ordinal number of thirteen: often written 13th

2. ( as noun )

   Friday the thirteenth

the fraction equal to one divided by 13 ( 1/ 13 )

music

1. an interval of one octave plus a sixth See also interval

2. short for thirteenth chord