eighteenth

ay-TEENTH/ˌeɪˈtiːnθ/

4 meanings of eighteenth

1
adjective
Coming right after the seventeenth when counting in order.
Her eighteenth birthday is next week.
This is the eighteenth time I've asked you to clean up.
2
nouncountable
The one in position number eighteen in a row, list, or order.
He was the eighteenth to cross the finish line.
Out of everyone waiting, she was the eighteenth in line.
3
nouncountable
One part out of eighteen equal parts of something.
Like cutting a cake into eighteen equal slices and taking just one.
Each child got an eighteenth of the chocolate bar.
Three eighteenths of the cake were already gone by noon.
4
nouncolloquialcountable
A party held to celebrate someone's eighteenth birthday.
We're planning a huge eighteenth for Maya next month.
His eighteenth went on late into the night.

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It comes from the word "eighteen" plus "-th", the ending used to make ordinal numbers.