twentieth

[twen-tee-ith, twuhn-]
adjective
1.
next after the nineteenth; being the ordinal number for 20.
2.
being one of 20 equal parts.
noun
3.
a twentieth part, especially of one (1/20).
4.
the twentieth member of a series.

Origin:
before 900; Middle English twentithe, Old English twentigotha. See twenty, -eth2

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World English Dictionary
twentieth (ˈtwɛntɪɪθ)
 
adj
1.  (usually prenominal)
 a.  coming after the nineteenth in numbering or counting order, position, time, etc; being the ordinal number of twenty: often written 20th
 b.  (as noun): he left on the twentieth
 
n
2.  a.  one of 20 approximately equal parts of something
 b.  (as modifier): a twentieth part
3.  the fraction that is equal to one divided by 20 (1/20)
 
[from Old English twentigotha]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for twentieth
A number of other twentieth century composers made extensive use of the fugue.
The latter part of the twentieth century saw the rise of multivolume vampire
  epics.
In the early twentieth century, a reaction against this huge spectacle emerged.
By the twentieth century, the order had become purely ceremonial.
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