eighteenth

 [ey-teenth]  

eight·eenth

   [ey-teenth]
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.

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Eighteenth is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a fool or simpleton; ninny.
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Origin:
before 900; Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins
World English Dictionary
eighteenth (ˈeɪˈtiːnθ)
 
—adj
1.  (usually prenominal)
 a.  coming after the seventeenth in numbering or counting order, position, time, etc; being the ordinal number of eighteen: often written 18th
 b.  (as noun): come on the eighteenth
 
—n
2.  a.  one of 18 approximately equal parts of something
 b.  (as modifier): an eighteenth part
3.  the fraction that is equal to one divided by 18 (1/18)

Collins English Dictionary - Complete & Unabridged 10th Edition
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