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An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Zoology) (in the evolution of animals) development of a head by the concentration of feeding and sensory organs and nervous tissue at the anterior end
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ceph•a•li•za•tion(ˌsɛf ə ləˈzeɪ ʃən)
a tendency in animal evolution to localization of important organs or parts in or near the head.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.