Separation may refer to:

Films

* ''Separation'' (1967 film), a British feature film written by and starring Jane Arden and directed by Jack Bond * ''

La Séparation ''La Séparation'' is a 1994 French romantic drama film directed by Christian Vincent and based on the novel ''La Séparation'' by Dan Franck. Plot When a Parisian couple, Pierre and Anne, go to see a film, it bothers Pierre that Anne rejects ...

'', 1994 French film * '' A Separation'', 2011 Iranian film * ''Separation'' (2013 film), an American thriller film starring Sarah Manninen * ''Separation'' (2021 film), an American horror film

Literature

* ''The Separation'' (Priest novel), a 2002 novel by Christopher Priest * ''The Separation'' (Applegate ovel), a 1999 novel in the ''Animorphs'' series by K.A. Applegate * ''Separation'', a 1976 Canadian political novel by

Richard Rohmer Richard Heath Rohmer (born 24 January 1924) is a Canadian aviator, lawyer, adviser, author and historian. Rohmer was born in Hamilton, Ontario, and spent some of his early youth in Pasadena, California, as well as in western Ontario at Windsor ...

Music

* ''Separation'' (album), by American alternative rock band Balance and Composure (2011) * ''Separation'' (EP), a 2006 EP by Halou * ''

Separates ''Separates'' is the second album by English punk rock band 999, released in 1978. ''Separates'' was released in the United States under the title ''High Energy Plan'', with a different cover and slightly altered track listing; on ''High Energ ...

'', album by 999 * ''Separations'' (album), a 1992 album by British alternative rock band Pulp * Separation (band), a Swedish straight edge hardcore punk band *

Separation mastering Stem-mixing is a method of Audio mixing, mixing audio material based on creating groups of audio tracks and Audio signal processing, processing them separately prior to combining them into a final master mix. Stems are also sometimes referred t ...

, in music recording

Law and politics

* Marital separation, when a married couple ceases living together without a divorce **

Legal separation Legal separation (sometimes judicial separation, separate maintenance, divorce ', or divorce from bed-and-board) is a legal process by which a married couple may formalize a separation while remaining legally married. A legal separation is gra ...

, a legal status where married couples may disentangle their finances without divorce *

Nonconformity to the world Nonconformity to the world, also called separation from the world, is a Christian doctrine based on , and other verses of the New Testament that became important among different Protestant groups, especially among Anabaptists. The corresponding Ge ...

(separation from the world), a belief among some Protestant religious groups that the members of a church should be separate from "the world" * Political separation (

separatism Separatism is the advocacy of cultural, ethnic, tribal, religious, racial, governmental or gender separation from the larger group. As with secession, separatism conventionally refers to full political separation. Groups simply seeking greate ...

), advocacy of a state of cultural, ethnic, tribal, religious, racial, governmental or gender separation from the larger group *

Separation of church and state The separation of church and state is a philosophical and jurisprudential concept for defining political distance in the relationship between religious organizations and the state. Conceptually, the term refers to the creation of a secular sta ...

, the idea that religion and government functions should be separate

Mathematics and science

Separation (behavior) Flocking is the behaviour exhibited when a group of birds, called a flock, are foraging or in flight. Computer simulations and mathematical models that have been developed to emulate the flocking behaviours of birds can also generally be appli ...

, the behavior of flocking animals to stand off from their neighbours *

Separation (statistics) In statistics, separation is a phenomenon associated with models for dichotomous or categorical outcomes, including logistic and probit regression. Separation occurs if the predictor (or a linear combination of some subset of the predictors) is ...

, a problem encountered in fitting models for categorical outcomes * Flow separation, separation of a fluid boundary layer from the surface of a solid body moving relative to the fluid * Intertemporal portfolio choice#Time-independent decisions, where in some contexts portfolio choices for many periods can be made separately * Separated sets, related concept in topology, two sets disjoint from the other's closure *

Separation axiom In topology and related fields of mathematics, there are several restrictions that one often makes on the kinds of topological spaces that one wishes to consider. Some of these restrictions are given by the separation axioms. These are sometime ...

, concepts in the area of mathematics called topology * Separation of concerns, in computer science (and problem-solving in general) *

Separation of variables In mathematics, separation of variables (also known as the Fourier method) is any of several methods for solving ordinary and partial differential equations, in which algebra allows one to rewrite an equation so that each of two variables occurs ...

, in mathematics to solve certain (separable) differential equations *

Separation principle In control theory, a separation principle, more formally known as a principle of separation of estimation and control, states that under some assumptions the problem of designing an optimal feedback controller for a stochastic system can be solved b ...

, in control theory * Separation process, in chemistry *

Separation theorem (disambiguation) Separation theorem may refer to several theorems in different scientific fields. Economics * Fisher separation theorem (corporation theory) - asserts that the objective of a corporation will be the maximization of its present value, regardless of ...

: several different theorems related to separation, in different scientific disciplines, for example: **

Mutual fund separation theorem In portfolio theory, a mutual fund separation theorem, mutual fund theorem, or separation theorem is a theorem stating that, under certain conditions, any investor's optimal portfolio can be constructed by holding each of certain mutual funds in app ...

, allowing a portfolio optimization problem to be separated into smaller problems *

Point-pair separation In a cyclic order, such as the real projective line, two pairs of points separate each other when they occur alternately in the order. Thus the ordering ''a b c d'' of four points has (''a,c'') and (''b,d'') as separating pairs. This point-pair s ...

, in an order two pairs of points may or may not separate each other

Other uses

* Separation (aeronautics), rules to minimise the risk of collision between aircraft in flight * Separation (United States military), the process by which a service member leaves active duty * Separation anxiety disorder, an anxiety disorder in which an individual experiences excessive anxiety regarding separation from home and/or from people to whom the individual has a strong emotional attachment *

Racial separation Racial segregation is the systematic separation of people into racial or other ethnic groups in daily life. Racial segregation can amount to the international crime of apartheid and a crime against humanity under the Statute of the Internati ...

, the separation of different racial groups in daily life *

Six degrees of separation Six degrees of separation is the idea that all people are six or fewer social connections away from each other. As a result, a chain of "friend of a friend" statements can be made to connect any two people in a maximum of six steps. It is also k ...