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alternative history

esp US alternate history

noun
  1. a genre of fiction in which the author speculates on how the course of history might have been altered if a particular historical event had had a different outcome
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012