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An individual is a person or a specific objectof being a person separate from other persons and possessing his or her own needs or goals. The exact definition of an individual is important in the fields of biology, law, and philosophy.
From the 15th century and earlier, and also today within the fields of statistics and metaphysics, individual meant "indivisible", typically describing any numerically singular thing, but sometimes meaning "a person." (q.v. "The problem of proper names"[clarification needed]). From the 17th century on, individual indicates separateness, as in individualism.
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An individual de facto lawfully defined usually refers to a natural person, as opposed to a legal person (which could be a corporation). It can also possibly be a person or a specific object if otherwise defined.
Philosophical views of the individual human
Early empiricists such as Ibn Tufail in early 12th century Islamic Spain, and John Locke in late 17th century England, introduced the idea of the individual as a tabula rasa ("blank slate"), shaped from birth by experience and education. This ties into the idea of the liberty and rights of the individual, society as a social contract between rational individuals, and the beginnings of individualism as a doctrine.
Hegel regarded history as the gradual evolution of Mind as it tests its own concepts against the external world. Each time the mind applies its concepts to the world, the concept is revealed to be only partly true, within a certain context; thus the mind continually revises these incomplete concepts so as to reflect a fuller reality (commonly known as the process of thesis, antithesis, and synthesis). The individual comes to rise above his or her own particular viewpoint, and grasps that he or she is a part of a greater whole insofar as he or she is bound to family, a social context, and/or a political order.
With the rise of existentialism, Kierkegaard rejected Hegel's notion of the individual as subordinated to the forces of history. Instead, he elevated the individual's subjectivity and capacity to choose his or her own fate. Later Existentialists built upon this notion. Nietzsche, for example, examines the individual's need to define his/her own self and circumstances in his concept of the will to power and the heroic ideal of the Übermensch. The individual is also central to Sartre's philosophy, which emphasizes individual authenticity, responsibility, and free will. In both Sartre and Nietzsche (and in Nikolai Berdyaev), the individual is called upon to create his or her own values. Rather than rely on external, socially imposed codes of morality.
In Buddhism, the concept of the individual lies in anatman, or "no-self." According to anatman, the individual is really a series of interconnected processes that, working together, give the appearance of being a single, separated whole. In this way, anatman, together with anicca, resembles a kind of bundle theory. Instead of an atomic, indivisible self distinct from reality (see Subject-object problem), the individual in Buddhism is understood as an interrelated part of an ever-changing, impermanent universe (see interdependence, Nondualism, reciprocity).
Objectivism regards every human as an independent, sovereign entity who possesses an inalienable right to his or her own life, a right derived from his or her nature as a rational being. Individualism and Objectivism hold that a civilized society, or any form of association, cooperation or peaceful coexistence among humans, can be achieved only on the basis of the recognition of individual rights — and that a group, as such, has no rights other than the individual rights of its members. The principle of individual rights is the only moral base of all groups or associations. Since only an individual man or woman can possess rights, the expression "individual rights" is a redundancy (which one has to use for purposes of clarification in today’s intellectual chaos), but the expression "collective rights" is a contradiction in terms. Individual rights are not subject to a public vote; a majority has no right to vote away the rights of a minority; the political function of rights is precisely to protect minorities from oppression by majorities (and the smallest minority on earth is the individual).
In biology, the question of what is an individual is related to the question of what is an organism, which is an important question in biology and philosophy of biology, but there has been little explicit work devoted to the biological notion of an individual. An individual organism is not the only kind of individual that is considered as a "unit of selection". Genes, genomes, or groups may function as individual units.
Asexual reproduction occurs in some colonial organisms, so that the individuals are genetically identical. Such a colony is called a genet, and an individual in such a population is referred to as a ramet. The colony, rather than the individual functions as a unit of selection. In other colonial organisms, the individuals may be closely related to one another, but differ as a result of sexual reproduction.
Honey bees in a colony are closely related to one another, but are not genetically identical
Coral colonies include many individual polyps, which may or may not be genetically identical to one another
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