Definition of I noun from the Oxford Advanced Learner's Dictionary

  

I

 noun
noun
BrE BrE////
 
; NAmE NAmE////
 
 
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  • (also i) [countable, uncountable] (pl. Is, I’s, i’s
    BrE BrE//aɪz//
     
    ; NAmE NAmE//aɪz//
     
    )
    the 9th letter of the English alphabet ‘Island’ begins with (an) I/‘I’.
  • Idioms
    dot your i’s and cross your t’s
     
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    to pay attention to the small details when you are finishing a task
    See the Oxford Advanced American Dictionary entry: I