next after the sixteenth; being the ordinal number for 17.
being one of 17 equal parts.
a seventeenth part, especially of one (1/17).
the seventeenth member of a series.

before 900; seventeen + -th2; replacing Middle English seventethe, Old English seofontēotha. (see seven, tithe) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seventeenth (ˈsɛvənˈtiːnθ)
1.  (usually prenominal)
 a.  coming after the sixteenth in numbering or counting order, position, time, etc; being the ordinal number of seventeen: often written 17th
 b.  (as noun): the ship docks on the seventeenth
2.  a.  one of 17 approximately equal parts of something
 b.  (as modifier): a seventeenth part
3.  the fraction equal to one divided by 17 (1/17)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
By the seventeenth century, though, the tide had begun to turn.
Make it the size of the solar system, what could reasonably be observed in the
  seventeenth century, and the argument applies.
Some of the musical instruments dated back to the seventeenth century.
The date is historically fixed at about the middle of the seventeenth century.
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