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.

Origin:
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. 2013.
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Eighteenth is always a great word to know.
So is quincunx. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
eighteenth (ˈeɪˈtiːnθ) [Click for IPA pronunciation guide]
 
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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Example sentences
He belonged to the eighteenth century, and the eighteenth century upset all his
  plans.
It makes perfect sense for an eighteenth century thinker to conclude that
  humanity would flourish under the market.
We reproach the eighteenth century with its artificiality.
The purpose of the first, in the eighteenth century, was to found a nation.
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