Who was the originator of the phrase "survival of the fittest"?
Herbert Spencer first used the descriptive phrase "survival of the fittest."
When Charles Darwin published the original edition of On the Origin of Species in 1859, the concept was in place but not that particular way of expressing it. In 1864, Spencer published the first volume of The Principles of Biology, which was "a survey of developmental physiology and an assertion of the iron law of evolution in the movement from lower to higher forms." In the text of this work, Spencer refers to the theories that Charles Darwin had developed.
This survival of the fittest... is that which Mr. Darwin has called 'natural selection, or the preservation of favoured races in the struggle for life'.
Darwin adopted the phrase and included it in the 1869 fifth edition of On the Origin of Species.