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The meaning of SURVIVAL OF THE FITTEST is the natural process by which organisms best adjusted to their environment are most successful in surviving and reproducing : natural selection —often used figuratively to describe a situation, attitude, etc., of fierce or ruthless competition.
Survival of the fittest, term made famous in the fifth edition of On the Origin of Species by Charles Darwin, which suggested that organisms best adjusted to their environment are the most successful in surviving and reproducing. The term was later used in economics, political theory, and eugenics.
"Survival of the fittest" [1] is a phrase that originated from Darwinian evolutionary theory as a way of describing the mechanism of natural selection. The biological concept of fitness is defined as reproductive success .
In biology, the definition of survival of the fittest is this, “a natural process resulting in the evolution of organisms best adapted to the environment”. The origin of this phrase is from the evolutionary theory proposed by Charles Darwin, an English naturalist and evolutionary biologist.
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You can use the survival of the fittest to refer to a situation in which only the strongest people or things continue to live or be successful, while the others die or fail. See full dictionary entry for survival
'Survival of the fittest', or 'natural selection' as it sometimes called, describes not the physical condition of an individual, but how well it is suited to its environment, as measured by its reproductive success over its lifetime - the ‘fittest’ being the species that in successive generations will leave most copies of itself.