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1. The world of the human intellect, or intellectual culture globally.

2. More locally the atmosphere or ethos of a given academic institution, political movement or other environment in which people come up with and share various ideas.
The instant he walked in the gates and started talking to people he found himself relaxing once more into the cerebrosphere of Cambridge.

I haven't been in the radical feminist cerebrosphere for some time now.
by Fearman March 04, 2008