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

  

third

 ordinal number
ordinal number
BrE BrE//θɜːd//
 
; NAmE NAmE//θɜːrd//
 
 
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  •  3rd There are examples of how to use ordinal numbers at the entry for fifth.
  • Word Origin Old English thridda, of Germanic origin; related to Dutch derde and German dritte, also to three. The spelling thrid was dominant until the 16th cent. (but thirdda is recorded in Northumbrian dialect as early as the 10th cent.).Idioms
    third time lucky(US English third time is the charm)
     
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     used when you have failed to do something twice and hope that you will succeed the third time
    See the Oxford Advanced American Dictionary entry: third