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Definition of Evolutionarily stable strategy

Evolutionarily stable strategy Definition from Science & Technology Dictionaries & Glossaries
Common Terms in Evolutionary Biology and Genetics
(ESS): A strategy such that, if most members of a population adopt it, would give a reproductive fitness higher than any mutant strategy.
Evolutionarily stable strategy Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
An evolutionarily stable strategy (ESS) is a strategy which, if adopted by a population in a given environment, cannot be invaded by any alternative strategy that is initially rare. It is relevant in game theory, behavioural ecology, and evolutionary psychology. An ESS is an equilibrium refinement of the Nash equilibrium. It is a Nash equilibrium that is "evolutionarily" stable: once it is fixed in a population, natural selection alone is sufficient to prevent alternative (mutant) strategies from invading successfully. The theory is not intended to deal with the possibility of gross external changes to the environment that bring new selective forces to bear.

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