Person

Wikipedia:

A person is a being, such as a human, that has certain capacities or attributes constituting personhood, the precise definition of which is the subject of much controversy. The common plural of "person", "people", is often used to refer to an entire nation or ethnic group (as in "a people"), so the plural "persons" is often used in contexts which require precision such as philosophical and legal writing.

Etymology

In ancient Rome, the word "persona" (Latin) or "prosopon" (πρόσωπον: Greek) originally referred to the masks worn by actors on stage. The various masks represented the various "personae" in the stage play, while the masks themselves helped the actor's voice resonate and made it easier for the audience to hear.

In Roman law, the word "persona" became used to refer to a role played in court, and it became established that it was the role rather than the actor that could have rights, powers, and duties, because different individuals could assume the same roles, the rights, powers, and duties followed the role rather than the actor, and each individual could act in more than one role, each a different "person" in law.

The concept of a "person" was further developed during the Trinitarian and Christological debates of the first through sixth centuries. Since then, a number of important changes to the word's meaning and use have taken place, and attempts have been made to redefine the word with varying degrees of adoption and influence.

Many modern speakers of colloquial English conflate the meanings of role and actor, which can result in some confusion when they try to enter into legal discourse.

Personhood

Personhood is the status of being a person. Defining personhood is a controversial topic in philosophy and law, and is closely tied to legal and political concepts of citizenship, equality, and liberty. According to law, only a natural person or legal personality has rights, protections, privileges, responsibilities, and legal liability. Personhood continues to be a topic of international debate. Historically, personhood was questioned during the abolition of slavery, the fight for women's rights and animal rights, debates about abortion, fetal rights and reproductive rights as well as debates about corporate personhood.

Various specific debates have focused and continue to focus on questions about the personhood of different classes of entities. Historically, the personhood of animals, women, and slaves has been a catalyst of social upheaval. Today, most living adult humans are usually considered persons, but depending on the context, theory or definition, the category of "person" may be taken to include such non-human entities as animals, corporations, sovereign states or other polities, estates in probate, artificial intelligences, or extraterrestrial life; and may exclude some human entities in prenatal development or those with extreme mental impairments or injuries. A deceased person may be considered a person or property, depending on jurisdiction.

Personal identity

Personal identity is the unique numerical identity of persons through time. That is to say, the necessary and sufficient conditions under which a person at one time and a person at another time can be said to be the same person, persisting through time. In the modern philosophy of mind, this concept of personal identity is sometimes referred to as the diachronic problem of personal identity. The synchronic problem is grounded in the question of what features or traits characterize a given person at one time.

Identity is an issue for both continental philosophy and analytic philosophy. A key question in continental philosophy is in what sense we can maintain the modern conception of identity, while realizing many of our prior assumptions about the world are incorrect.

Proposed solutions to the problem of personal identity include continuity of the physical body, continuity of an immaterial mind or soul, continuity of consciousness or memory, the bundle theory of self, and proposals that there are actually no persons or selves which persist over time at all.