adj
eighteenth
ay-TEENTH
adj
1
Coming after seventeen others in a sequence; number 18 in an ordered list.
"This is the eighteenth chapter of the book."
noun
1
One of eighteen equal parts of something.
"Each slice was roughly an eighteenth of the whole pie."
2
(informal) A party celebrating someone's eighteenth birthday.
"She invited half her school to her eighteenth."
How to Use Eighteenth
Learner’s notesIn plain EnglishThe ordinal form of eighteen — eighteenth in line, or one part out of eighteen.
Word Forms
eighteenths plural
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This is the _____ chapter of the book.