thirteenth Meaning, Definition & Usage

  1. noun position 13 in a countable series of things
  2. adjective satellite coming next after the twelfth in position
    13th.

WordNet

Thir"teenth` adjective
Etymology
From Thirteen: cf. AS. reóteóa.
Definitions
  1. Next in order after the twelfth; the third after the tenth; -- the ordinal of thirteen; as, the thirteenth day of the month.
  2. Constituting or being one of thirteen equal parts into which anything is divided.
Thir"teenth` noun
Definitions
  1. The quotient of a unit divided by thirteen; one of thirteen equal parts into which anything is divided.
  2. The next in order after the twelfth.
  3. (Mus.) The interval comprising an octave and a sixth.

Webster 1913