The Collaborative International Dictionary of English v.0.48:

officialese \officialese\ n.
   the formal and often obscure style of writing characteristic
   of some government officials; bureaucratese; -- it is
   characterized by euphemisms, circumlocutions, vague
   abstractions, and circumlocutions.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

officialese
    n 1: the style of writing characteristic of some government
         officials: formal and obscure