Yea, it's a common term among evolutionist. Where have you been????
Survival of the fittest
https://en.wikipedia.org/wiki/Survival_of_the_fittest
Survival of the fittest" is a
phrase that originated from an
evolutionary theory as a way of describing the mechanism of
natural selection. The biological concept of
fitness is defined as
reproductive success. In Darwinian terms the phrase is best understood as "Survival of the form that will leave the most copies of itself in successive generations."
Herbert Spencer first used the phrase – after reading
Charles Darwin's
On the Origin of Species – in his
Principles of Biology (1864), in which he drew parallels between his own economic theories and Darwin's biological ones, writing, "This survival of the fittest, which I have here sought to express in mechanical terms, is that which Mr. Darwin has called 'natural selection', or the preservation of favoured races in the struggle for life."
[1]
Darwin responded positively to
Alfred Russel Wallace's suggestion of using Spencer's new phrase "survival of the fittest" as an alternative to "natural selection", and adopted the phrase in
The Variation of Animals and Plants under Domestication published in 1868.
[1][2] In
On the Origin of Species, he introduced the phrase in the fifth edition published in 1869,
[3][4] intending it to mean "better designed for an immediate, local environment".
[5][6]
