What is "grammatical person"

n. (context grammar English) A linguistic category used to distinguish between the speaker of an utterance and those to whom or about whom he is referring; implemented in most languages by a variety of pronouns, and in inflected languages by variation in word endings.

Grammatical person, in linguistics, is the grammatical distinction between deictic references to participant(s) in an event; typically the distinction is between the speaker (first person), the addressee (second person), and others (third person). Grammatical person typically defines a language's set of personal pronouns. It also frequently affects verbs, sometimes nouns, and possessive relationships.