Definition of the first person noun from the Oxford Advanced American Dictionary

     

    the first person

     noun
    noun
     
    [singular]
     
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  1. 1 (grammar) a set of pronouns and verb forms used by a speaker to refer to himself or herself, or to a group including himself or herself “I am” is the first person singular of the present tense of the verb “to be.” “I,” “me,” “we,” and “us” are first-person pronouns.
  2. 2a way of writing a novel, etc. as if one of the characters is telling the story using the word I a novel written in the first person compare the second person, the third person
See the Oxford Advanced Learner's Dictionary entry: the first person