ˈthirˈteenth

/ ˈθɜːˈtiːnθ /

adjective

1. 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

noun

1. 1. one of 13 equal or nearly equal parts of something
   2. ( as modifier )

      a thirteenth part

2. the fraction equal to one divided by 13 ( 1 13 )
3. music
   1. an interval of one octave plus a sixth See also interval
   2. short for thirteenth chord