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.