Real Dictionary

natural selection
uncountable noun: Natural selection is a process by which species of animals and plants that are best adapted to their environment survive and reproduce, while those that are less well adapted die out.

natural selection in American English
in evolution, the process by which those individuals (of a species) with characters that help them to become adapted to their specific environment tend to leave more progeny and transmit their characters, while those less able to become adapted tend to le
noun: the process by which forms of life having traits that better enable them to adapt to specific environmental pressures, as predators, changes in climate, or competition for food or mates, will tend to survive and reproduce in greater numbers than others of

natural selection in British English
noun: a process resulting in the survival of those individuals from a population of animals or plants that are best adapted to the prevailing environmental conditions. The survivors tend to produce more offspring than those less well adapted, so that the charac