adjective. ['ˈθɝːˈtiːnθ'] coming next after the twelfth in position.
Rhymes with Thirteenth
noun. ['ˈθɝːˈtiːnθ'] position 13 in a countable series of things.
Sentences with thirteenth
1. Noun, singular or mass
Some saddles may feature a thirteenth and fourteenth digit as well; these digits were added to the serial number of saddles when multiple, identical saddles were manufactured at the same time.
Bear in mind after the twelfth week injection the birth control protection will not be effective from the thirteenth week.