1a human being regarded as an individual:the porter was the last person to see her prior to her disappearanceshe is a person of astonishing energy
(in legal or formal contexts) an unspecified individual:each of the persons using unlawful violence is guilty of riotthe entrance fee is £2.00 per person
[with modifier] an individual characterized by a preference or liking for a specified thing:she’s not a cat person
a character in a play or story:his previous roles in the person of a fallible cop
an individual’s body:I would have publicity photographs on my person at all times
dated (especially in legal contexts) used euphemistically to refer to a man’s genitals.
2 Grammar a category used in the classification of pronouns, possessive determiners, and verb forms, according to whether they indicate the speaker (first person), the addressee (second person), or a third party (third person).
3 Christian Theology each of the three modes of being of God, namely the Father, the Son, or the Holy Ghost, who together constitute the Trinity.
be one's own person
do or be what one wishes or in accordance with one’s own character rather than as influenced by others:she certainly did not live in the shadow of John; she was her own person
in one's own person
archaic oneself; in person (used for emphasis):I needed a housekeeper who would undertake, in her own person, all the duties of the home
in person
with the personal presence or action of the individual specified:he had to pick up his welfare cheque in person
in the person of
in the physical form of:trouble arrived in the person of a short, moustached Berliner