As literary political fiction and as dystopian science-fiction, Nineteen Eighty-Four is a classic novel in content, plot, and style. Many of its terms and concepts, such as Big Brother, doublethink, thoughtcrime, Newspeak, and memory hole, have entered everyday use since its publication. Moreover, Nineteen Eighty-Four popularised the adjective Orwellian, which describes official deception, secret surveillance, and manipulation of the past by a totalitarian or authoritarian state. In 2005 the nov