Definition of punctuated equilibrium
: evolution that is characterized by long periods of stability in the characteristics of an organism and short periods of rapid change during which new forms appear especially from small subpopulations of the ancestral form in restricted parts of its geographic range
also
: a theory or model of evolution emphasizing this — compare gradualism sense 2
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Merriam-Webster unabridged
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Time Traveler for punctuated equilibrium
The first known use of punctuated equilibrium was in 1972
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