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The word regime (also "régime", from the original French pronunciation) refers to a set of conditions, most often of a political nature.
While the word regime originates as a synonym for any form of government, modern usage often gives the term a negative connotation, implying an authoritarian government or dictatorship. Webster's definition states that the word regime refers simply to a form of government, while Oxford English Dictionary defines regime as "a government, especially an authoritarian one". Nowadays the political use the word regime is most commonly applied to any government that is most of the time not democratically elected and imposes strict and often arbitrary rules and laws on the people that are, because of the undemocratic nature of the government, non-negotiable.
International political use of regime concerns international regulatory agencies (see International regime), which lie outside of the control of national governments. These have more power over a greater range than postal or telecommunications agreements, for example, and constrain national governments.
In scientific discussions, a regime is a class of physical conditions, usually parameterised by some specific measures, where a particular physical phenomenon or boundary condition is significant. Very often a regime corresponds to a limiting condition. The region of measurable parameter space that corresponds to a regime is very often loosely defined. Examples include "the superfluid regime", "the steady state regime" or "the femtosecond regime".
See also 
- Ancien Régime
- Carbon audit regime
- Exchange rate regime
- International regime
- Legal practice
- Regime change
- Regime shift
- Regime theory
- River regime
- Regime as defined in the Merriam–Webster website
- Regime as defined in the Oxford English Dictionary
- Fermi gases approach superfluid regime
- A. R. Kolovsky, Steady-state regime for the rotational dynamics of a molecule at the condition of quantum chaos, Phys. Rev. A 48 (1993) 3072
- M. Lenzner et al., Femtosecond Optical Breakdown in Dielectrics, PRL 80 (1998) 4076
Essentials of Comparative Government, Patrick O'Neil.