ev·o·lu·tion
[ev-uh-loo-shuh
n or, especially Brit., ee-vuh-]
1.
any process of formation or growth; development: the evolution of a language; the evolution of the airplane.
2.
a product of such development; something evolved: The exploration of space is the evolution of decades of research.
3.
Biology . change in the gene pool of a population from generation to generation by such processes as mutation, natural selection, and genetic drift.
4.
a process of gradual, peaceful, progressive change or development, as in social or economic structure or institutions.
5.
a motion incomplete in itself, but combining with coordinated motions to produce a single action, as in a machine.
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