In principle it was something more similar to what we call character, today it has a broader meaning since it is an individual to which we attribute its own characteristics, albeit with the same value as all of its group. This understands best legally, where a person has rights even if he is not human. In grammar it is a category of pronoun, which is associated in the verb with who acts and to what or who. It is usually used in a phrase as "someone". It comes to us from the Latin 'person' ("mask of the actor" ) but has a background in other languages.
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