Definition of thirtieth ordinal number from the Oxford Advanced Learner's Dictionary

  

thirtieth

 ordinal number
ordinal number
BrE BrE//ˈθɜːtiəθ//
 
; NAmE NAmE//ˈθɜːrtiəθ//
 
 
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30th There are examples of how to use ordinal numbers at the entry for fifth.

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