The definition of cephalization means the trend in evolution for the nervous system and the sensory organs to be positioned near the human or animal head.
An example of cephalization is the tendency for an animal's ears to be on its head.
the tendency in the evolution of animal life for sensory organs, the nervous system, etc. to become centralized in or near the head
Origin of cephalizationcephal(o)- + -ization
An evolutionary trend in the animal kingdom toward centralization of neural and sensory organs in the head or anterior region of the body.