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eighteenth

[ey-teenth]
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adjective
  1. next after the seventeenth; being the ordinal number for 18.
  2. being one of 18 equal parts.
noun
  1. an eighteenth part, especially of one (1/18).
  2. the eighteenth member of a series.

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. 2018

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British Dictionary definitions for eighteenth

eighteenth

adjective
  1. (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
  1. 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

Word Origin and History for eighteenth

adj.

mid-13c., egtetenþe, modified, by influence of eighteen, from Old English eahtateoða; from eight + teoða "tenth" (see -ty (1)).

Online Etymology Dictionary, © 2010 Douglas Harper

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