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eighteenth

[ ey-teenth ]
/ ˈeɪˈtinθ /
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adjective

next after the seventeenth; being the ordinal number for 18.
being one of 18 equal parts.

noun

an eighteenth part, especially of one (1/18).
the eighteenth member of a series.

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Origin of eighteenth

before 900; Middle English eightenthe, eightethe,Old English eahtatēotha.See eighteen + -th2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use eighteenth in a sentence

British Dictionary definitions for eighteenth

eighteenth
/ (ˈeɪˈtiːnθ) /

adjective

(usually prenominal)
  1. coming after the seventeenth in numbering or counting order, position, time, etc; being the ordinal number of eighteen: often written 18th
  2. (as noun)come on the eighteenth

noun

  1. one of 18 approximately equal parts of something
  2. (as modifier)an eighteenth part
the fraction that is equal to one divided by 18 (1/18)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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