Separation

Separation may refer to:

Separation (United States military), the process by which a service member leaves active duty
Separation (air traffic control), rules to minimise the risk of collision between aircraft in flight
Separation mastering, in music recording

Literature, film, and music[edit]

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, 2011 Iranian film
Separation (2013 film), a 2013 American thriller film starring Sarah Manninen
Separation, a 1990 TV film starring David Suchet and Rosanna Arquette

The Separation (Christopher Priest novel), novel by Christopher Priest
The Separation (Animorphs), a 1999 novel in the Animorphs series by K.A. Applegate
Separation, a 1976 Canadian political novel by Richard Rohmer

Flow separation, separation of a fluid boundary layer from the surface of a solid body moving relative to the fluid
Separation of concerns, in computer science (and problem-solving in general)
Separation process, in chemistry
Separation principle, in control theory
Separation axiom, concepts in the area of mathematics called topology
Separated sets, related concept in topology, two sets disjoint from the other's closure
Separation (behavior), the behavior of flocking animals to stand off from their neighbours
Separation (statistics), a problem encountered in fitting models for categorical outcomes
Separation theorem (disambiguation): several different theorems related to separation, in different scientific disciplines, for example:
- Mutual fund separation theorem, allowing a portfolio optimization problem to be separated into smaller problems
Intertemporal portfolio choice#Time-independent decisions, where in some contexts portfolio choices for many periods can be made separately

Doctrine of separation, belief among some Protestant religious groups that the members of a church should be separate from "the world"
Legal separation, a legal status where married couples may disentangle their finances without divorce
Racial separation, the separation of different racial groups in daily life
Six degrees of separation, the idea that everyone is on average approximately six steps away, by way of introduction, from any other person on earth

Separation of church and state, the idea that religion and government functions should be separate
Political separation (separatism), advocacy of a state of cultural, ethnic, tribal, religious, racial, governmental or gender separation from the larger group