eighteenth
🇺🇸
/ˌeɪˈtiːnθ/
🇬🇧
/ˌeɪˈtiːnθ/
The position in a sequence that follows the seventeenth and precedes the nineteenth.
In 2018, she celebrated her eighteenth birthday with a big party.
One of 18 equal parts into which something is or can be divided.
I will give you one eighteenth of the cake.