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WordReference Random House Unabridged Dictionary of American English © 2024eight•eenth (ā′tēnth′),USA pronunciation adj. - next after the seventeenth;
being the ordinal number for 18. - being one of 18 equal parts.
n. - an eighteenth part, esp. of one (1⁄18).
- the eighteenth member of a series.
- Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th2 bef. 900
Collins Concise English Dictionary © HarperCollins Publishers:: ˈeighˈteenth /ˈeɪˈtiːnθ/ adj - (usually prenominal) coming after the seventeenth in numbering or counting order, position, time, etc; being the ordinal number of eighteen: often written 18th
- (as noun): come on the eighteenth
n - one of 18 approximately equal parts of something
- (as modifier): an eighteenth part
- the fraction that is equal to one divided by 18 ( 1⁄18)
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