Thir"teenth` (?), a. [From Thirteen: cf. AS. þreóteóða.] 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`, n. 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.

Thir"teenth` (?), a. [From Thirteen: cf. AS. þreóteóða.] 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`, n. 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.

• The ordinal form of the number thirteen.
  
• The person or thing in the thirteenth position.
  
• One of thirteen equal parts of a whole.