Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A statement or other linguistic construction expressing an idea that is presupposed to be false, as I would go in the sentence I would go if I could.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective counterfactual

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

contra- +‎ factual

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Examples

  • Mandelson argues that Britain's Digital Economy will be based on the contrafactual premise of a steady decrease in computer speed, drive capacity, technical competence, network versatility and network ubiquity.

    Boing Boing 2009

  • We've decided to choose the 2008 Hugo Award-winning author Elizabeth Bear - and the book of hers we'll be perusing together is New Amsterdam, a series of linked stories: six novelettes and novellas about Detective Crown Investigator Abigail Irene Garrett and Don Sebastien de Ulloa, who are, respectively, a forensic sorcerer and an amateur detective in a turn of the century contrafactual history set (mostly) on the East Coast of North America.

    Boing Boing 2009

  • In contrafactual history, I don't have to spend six days worrying about what to call a galvanized nail in a world with no Lord Galvan.

    a complex and sometimes lethal machine barbara_hambly 2009

  • He is the ultimate "contrafactual traveler," seduced each time by the sudden insight that "I could so easily have had another life, lived elsewhere, loved others, been someone else."

    Booking a Journey Elizabeth Lowry 2011

  • Our tropes and concepts have been subsumed across mainstream literature and within other genres -- everything from the contrafactual fantasies of magic realism to the bestsellers you've cited by Margaret Atwood, Cormac McCarthy and many other figures of the literary establishment, all the way to the thriving sub-genres within romance which focus on time travel and other SFnal elements.

    MIND MELD: The Future of Written Science Fiction 2008

  • For a contrafactual: if atonality hadn't gone past, say, Crawford and Ruggles, I wonder if it would have been perceived as sufficiently monolithic (whether it is or not) to inspire other movements in reaction.

    Odometer Matthew Guerrieri 2008

  • That whopper of a contrafactual raises the question of motivation — modernist complexity was, after all, not being created in a largely welcoming world, but in the face of a mass audience conditioned towards a very different kind of musical discourse.

    Archive 2008-07-01 Matthew Guerrieri 2008

  • That whopper of a contrafactual raises the question of motivation — modernist complexity was, after all, not being created in a largely welcoming world, but in the face of a mass audience conditioned towards a very different kind of musical discourse.

    Greetings from Hooverville Matthew Guerrieri 2008

  • Two of the remaining ones are set in not-Iceland and two are set in Elizabethan England, both of which were mostly if not entirely devoid of nonwhite people (although there were a very few blacks in Elizabethan London), and one is set in contrafactual upper-class New York.

    he's got a mean look sittin' on in his eye, gonna shoot some poor son of a bitch just to see him die matociquala 2007

  • As for "why MWI" I would say that one reason is that it is the most parsimonious theory (two less assumptions), another is that it takes contrafactual definiteness seriously and makes it explicit AFAIU (as opposed to, say, the classical Copenhagen interpretation), and yet another is that it relies on decoherence.

    If We Live in a Multiverse, How Many Are There? | Universe Today 2009

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