# eighteenth

Pronunciation: say "ay-TEENTH" /ˌeɪˈtiːnθ/

## Adjective

1. Coming after the seventeenth in a sequence; the ordinal form of the number eighteen.
   - Simple: Coming right after the seventeenth when counting in order.
   - _She turned the page to the eighteenth chapter of the novel._
   - _His office sits on the eighteenth floor of the tower._

## Noun

2. The person or thing occupying position number eighteen in a sequence.
   - Simple: The one in position number eighteen in a row, list, or order.
   - _Among the candidates interviewed, he was the eighteenth that day._
   - _Counting from the front entrance, this house is the eighteenth on the street._
3. Any one of eighteen equal parts into which a whole is divided.
   - Simple: One part out of eighteen equal parts of something.
   - _Each investor was entitled to an eighteenth of the company's annual profits._
   - _The recipe calls for an eighteenth of a teaspoon of the rare spice._
4. A celebration party marking a person's eighteenth birthday. *(colloquial)*
   - Simple: A party held to celebrate someone's eighteenth birthday.
   - _She rented a hall by the river for her eighteenth._
   - _Half the school showed up to his eighteenth on Saturday._

## Origin

This comes from Middle English "eiȝtenþe", from Old English "eahtatēoþa", going back to Proto-Germanic. It is simply "eighteen" plus the ordinal suffix "-th".

Source: DictionaryAI, https://dictionaryai.com/define/eighteenth (written from Wiktionary data, CC BY-SA 4.0: https://creativecommons.org/licenses/by-sa/4.0/).