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eighteenth

[ey-teenth] /ˈeɪˈtinθ/
adjective
1.
next after the seventeenth; being the ordinal number for 18.
2.
being one of 18 equal parts.
noun
3.
an eighteenth part, especially of one (1/18).
4.
the eighteenth member of a series.
Origin of eighteenth
900
before 900; Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th2
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for eighteenth

eighteenth

/ˈeɪˈtiːnθ/
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
2.
  1. one of 18 approximately equal parts of something
  2. (as modifier): an eighteenth part
3.
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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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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Word Value for eighteenth

17
17
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