Lamarckism definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a theory of organic evolution advanced by Lamarck that claimed acquired characters can be inherited
Lamarckism definition by American Heritage Dictionary
A theory of biological evolution holding that species evolve by the inheritance of traits acquired or modified through the use or disuse of body parts.
Origin: After Chevalier de Jean Baptiste Pierre Antoine de Monet Lamarck.