The Collaborative International Dictionary of English v.0.48:

Academe \Ac`a*deme"\, n. [L. academia. See Academy.]
   An academy. [Poetic] --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

academe
    n 1: the academic world [syn: academia, academe]

The Devil's Dictionary (1881-1906):

ACADEME, n.  An ancient school where morality and philosophy were
taught.