Definition of no one pronoun from the Oxford Advanced Learner's Dictionary

  

no one

 pronoun
pronoun
BrE BrE//ˈnəʊ wʌn//
 
; NAmE NAmE//ˈnoʊ wʌn//
 
(also nobody)
 
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not anyone; no person No one was at home. There was no one else around. We were told to speak to no one. No one is much more common than nobody in written English.
See the Oxford Advanced American Dictionary entry: no one