From The Collaborative International Dictionary of English v.0.48:

neocortex \neocortex\ n.
   The cortical part of the neencephalon; the most recently
   evolved part of the cerebral cortex of the brain of higher
   animals, and the site of most of the higher brain functions;
   called also neopallium.

   Syn: neopallium.
        [WordNet 1.5]
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