Definify.com
Webster 1913 Edition
Thirteenth
1.
Next in order after the twelfth; the third after the tenth; – the ordinal of thirteen;
as, the
. thirteenth
day of the month2.
Constituting or being one of thirteen equal parts into which anything is divided.
Thir′teenthˊ
,Noun.
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 1828 Edition
Thirteenth
THIRTEENTH
,Adj.
THIRTEENTH
,Noun.