Thirteenth is an Italian fairy tale collected by Thomas Frederick Crane in Italian Popular Tales.

The interval comprising an octave and a sixth.

a compound sixth

Next in order after the twelfth; the third after the tenth; -- the ordinal of thirteen; as, the thirteenth day of the month.

The next in order after the twelfth.

coming next after the twelfth in position

Constituting or being one of thirteen equal parts into which anything is divided.

The quotient of a unit divided by thirteen; one of thirteen equal parts into which anything is divided.

position 13 in a countable series of things

In music or music theory, a thirteenth is the note thirteen scale degrees from the root of a chord.