noun
1.
a. : a set of linguistic forms (as verb forms, pronouns, and inflectional affixes) referring to the person or thing addressed in the utterance in which they occur
Latin videtis “you see” is in the second person plural
English you is a pronoun of the second person
b. : a linguistic form belonging to such a set
Latin vides “you see” and is “you go” are second persons
2. : reference of a linguistic form to the person or thing addressed in the utterance in which it occurs
the Latin verb ending -s that marks the second person