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Evolution

ev·o·lu·tion (noun) 1. A gradual process in which something changes into a different and usually more complex or better form. See Synonyms at development. 2. (a) The process of developing. (b) Gradual development. 3. Biology (a) 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. (b) The historical development of a related group of organisms; phylogeny. 4. A movement that is part of a set of ordered movements.

  — Excerpted from the definition of “evolution” in The American Heritage® Dictionary of the English Language, Fourth Edition, accessed via Dictionary.com


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