encephalization noun. 
[ɛn,sɛf(ǝ)lʌɪ'zeɪʃ(ǝ)n] Also 
encephalisation. 
M20.[from ENCEPHALO- + -IZATION.]An evolutionary increase in the complexity or relative size of the brain; a shift of function from non-cortical parts of the brain to the cortex. 
 [TahlilGaran] English Dictionary ▲