survival of the fittest

Definitions of survival of the fittest
1

n a natural process resulting in the evolution of organisms best adapted to the environment

Synonyms:
natural selection, selection, survival
Type of:
action, activity, natural action, natural process
a process existing in or produced by nature (rather than by the intent of human beings)

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.