evolution

evolution definition - medical

ev·o·lu·tion (ĕvˌə-lo͞oˈshən, ēˌvə-)

noun
  1. A continuing process of change from one state or condition to another or from one form to another.
  2. The theory that groups of organisms change with passage of time, mainly as a result of natural selection, so that descendants differ morphologically and physiologically from their ancestors.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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