1. In biology: Descent with modification. Change in the genetic composition of a population during successive generations, as a result of natural selection acting on the genetic variation among individuals, and resulting in the development of new species.
2. In everyday speech: A gradual process in which something changes into a different and usually more complex or better form.
1. Darwin's theory of evolution does for biology what quantum mechanics does for physics.
2. It is interesting to note the evolution in computers over the years.
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