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