Longman Dictionary of Contemporary English homepage

natural selection

 noun
     
Related topics: Biology, Society
natural selection [uncountable] technical
HBS the process by which only plants and animals that are naturally suitable for life in their environment will continue to live and breed, while all others will die out [↪ evolution]

➔ survival of the fittest

at survival (2)
Definition from the Longman Dictionary of Contemporary English
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