eighteenth

[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.

Origin:
before 900; Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th2

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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)

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Example sentences
Is preserved especially its architecture, dating from the eighteenth century.
It makes perfect sense for an eighteenth century thinker to conclude that
  humanity would flourish under the market.
The inn dates to the eighteenth century, and remains open for lodging and
  dining.
By the end of the eighteenth century, guilds had been abolished.
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