Definition - A grammatical category used to classify pronouns, possessives, and verb forms according to whether they indicate the speaker, the person or thing being spoken to, or a third party.

1. Most languages implement this with either pronouns or inflections.

Example -
Grammatical person is expressed by English pronouns: I am leaving (first person), You are leaving (second person), and He is leaving (third person)

Etymology -
The term derives from the Old French persone, which in turn derives from the Latin persona, which was Varro's translation of the Greek Dionysius Thrax's πpοσωποποιία, making a mask.

Oxford English Dictionary -
Its first citation in its grammatical sense is from 1520:
"Ye verbe shal be ye fyrst persone."
(Whitinton Vulg. (1527) 8b)

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