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'', 1994 French film * ''

A Separation ''A Separation'' ( fa, جدایی, Jodâyi; also titled ''Nader and Simin, A Separation'') is a 2011 Iranian drama film written and directed by Asghar Farhadi, starring Leila Hatami, Peyman Moaadi, Shahab Hosseini, Sareh Bayat, and Sarina Farhad ...

'', 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

Music

* ''Separation'' (album), by American alternative rock band

Balance and Composure Balance and Composure was an American alternative rock band from Doylestown, Pennsylvania. They formed in the winter of 2007, after the breakup of two local Doylestown bands. The band's music was often suggested having similarities to Title Fig ...

(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) Separation was a Swedish straight edge hardcore punk band from Umeå that existed between 1994 and 1999. Band members Final line-up *Axel Stattin ( Alan on Depression...) - bass (1994–1999) *Lars Strömberg (a.k.a. Lloyd on Depression. ...

, a Swedish straight edge hardcore punk band * Separation mastering, in music recording

Law and politics

Marital separation Marital separation occurs when spouses in a marriage stop living together without getting divorced. Married couples may separate as an initial step in the divorce process or to gain perspective on the marriage and determine whether divorce is warra ...

, when a married couple ceases living together without a divorce ** Legal separation, a legal status where married couples may disentangle their finances without divorce * Nonconformity to the world (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), 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), 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 In fluid dynamics, flow separation or boundary layer separation is the detachment of a boundary layer from a surface into a wake. A boundary layer exists whenever there is relative movement between a fluid and a solid surface with viscous f ...

, 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 In topology and related branches of mathematics, separated sets are pairs of subsets of a given topological space that are related to each other in a certain way: roughly speaking, neither overlapping nor touching. The notion of when two sets a ...

, 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 sometimes ...

, concepts in the area of mathematics called topology *

Separation of concerns In computer science, separation of concerns is a design principle for separating a computer program into distinct sections. Each section addresses a separate '' concern'', a set of information that affects the code of a computer program. A concern ...

, 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 A separation process is a method that converts a mixture or a solution of chemical substances into two or more distinct product mixtures, a scientific process of separating two or more substance in order to obtain purity. At least one product mi ...

, 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 ap ...

, allowing a portfolio optimization problem to be separated into smaller problems * Point-pair separation, in an order two pairs of points may or may not separate each other

Other uses

Separation (aeronautics) In air traffic control, separation is the name for the concept of keeping an aircraft outside a minimum distance from another aircraft to reduce the risk of those aircraft colliding, as well as prevent accidents due to secondary factors, such as ...

, rules to minimise the risk of collision between aircraft in flight *

Separation (United States military) In the US armed forces, separation means that a person is leaving active duty but not necessarily the service entirely. Separation typically occurs when someone reaches the date of their Expiration of Term of Service (ETS) and are released from acti ...

, the process by which a service member leaves active duty *

Separation anxiety disorder Separation anxiety disorder (SAD) is 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 (e.g., a parent, caregiver, ...

, 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, 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 ...

, the idea that everyone is on average approximately six steps away, by way of introduction, from any other person on earth *

Curdling Curdling is the breaking of an emulsion or colloid into large parts of different composition through the physio-chemical processes of flocculation, creaming, and coalescence. Curdling is purposeful in the production of cheese curd and tofu; u ...