adj
thirteenth
thur-TEENTH
adj
1
Coming after the twelfth and before the fourteenth; ordinal form of thirteen.
"Today is his thirteenth birthday."
noun
1
One of thirteen equal parts of something.
"Each share is worth one thirteenth of the total."
How to Use Thirteenth
Learner’s notesIn plain EnglishThe one after twelfth — describing position in order, or one of thirteen equal parts.
Word Forms
thirteenths plural
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Etymology
From thirteen plus the ordinal suffix -th.