next after the forty-ninth; being the ordinal number for 50.
being one of 50 equal parts.
a fiftieth part, especially of one (1/50).
the fiftieth member of a series.

before 1000; Middle English fiftithe, Old English fīftigotha. See fifty, -th2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fiftieth (ˈfɪftɪɪθ)
1.  a.  being the ordinal number of fifty in order, position, time, etc. Often written: 50th
 b.  (as noun): the fiftieth in the series
2.  a.  one of 50 equal or approximately equal parts of something
 b.  (as modifier): a fiftieth part
3.  the fraction equal to one divided by 50 (1/50)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The signals can change sharply in as little as one fiftieth of a second.
Batteries, on the other hand, have improved how much power they deliver at roughly one fiftieth of that pace.
It is reissued here with a new introduction by the author on the fiftieth anniversary of its first publication.
The resultant exposure time should be in the range of one two-hundred-and-fiftieth to one two-thousandth of a second.
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