Thirteenth

1. n. The interval comprising an octave and a sixth.
2. a. Next in order after the twelfth; the third after the tenth; — the ordinal of thirteen; as, the thirteenth day of the month.
3. a. Constituting or being one of thirteen equal parts into which anything is divided.
4. n. The quotient of a unit divided by thirteen; one of thirteen equal parts into which anything is divided.
5. n. The next in order after the twelfth.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.