Dar ‧ win ‧ is ‧ m /ˈdɑːwənɪz ə m, ˈdɑːwɪnɪz ə m $ ˈdɑːr-/ BrE AmE noun [uncountable]
the Theory of Evolution, the idea that plants and animals develop gradually from simpler to more complicated forms by ↑ natural selection , which is the process by which only plants and animals that are naturally suitable for life in their environment will continue to live, while all others will die