eighteenth
/ˌeɪˈtiːnθ/ adjective, noun
Forms eighteenths
- adjective The ordinal form of the number eighteen.
- noun The person or thing in the eighteenth position.
- noun One of eighteen equal parts of a whole.
- noun (informal) A party to celebrate an eighteenth birthday.
Synonyms
Etymology
Inherited from Middle English eightetenthe, eightetethe, from Old English eahtatēoþa, from Proto-Germanic *ahtudô tehundô. Equivalent to eighteen + -th (ordinal suffix).
Webster’s 1913
- adjective Next in order after the seventeenth.
- adjective Consisting of one of eighteen equal parts or divisions of a thing.
- noun The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
- noun The eighth after the tenth.
Etymology [From Eighteen.]
Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “eighteenth”, CC BY-SA 4.0. Details