Top Definition
The years between 2000 and 3000. Being the millennium that the human brain/mind makes its greatest leaps in power, knowledge and exploration. The connecting of all human thought in real-time will most likely occur in the next 1000 years. The word "Cerebellennium" is a combination, or portmanteau, of the words CEREBELLUM (part of brain) and MILLENNIUM (a thousand years).
The human mind will change in unforeseeable ways over the next 1000 years, as the Cerebellennium unfolds.
by Gregory Alan Elliott 2 December 23, 2009
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