thirtieth

thirtieth

[thur-tee-ith]
adjective
1.
next after the twenty-ninth; being the ordinal number for 30.
2.
being one of 30 equal parts.
noun
3.
a thirtieth part, especially of one (1/30).
4.
the thirtieth member of a series.

Origin:
before 900; thirty + -eth2; replacing Middle English thrittythe, Old English thrītegtha

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World English Dictionary
thirtieth (ˈθɜːtɪɪθ)
 
adj
1.  (usually prenominal)
 a.  being the ordinal number of thirty in counting order, position, time, etc: often written 30th
 b.  (as noun): the thirtieth of the month
 
n
2.  a.  one of 30 approximately equal parts of something
 b.  (as modifier): a thirtieth part
3.  the fraction equal to one divided by 30 (1/30)

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