science fiction

noun
a form of fiction that draws imaginatively on scientific knowledge and speculation in its plot, setting, theme, etc.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
science fiction
 
n
a.  a literary genre that makes imaginative use of scientific knowledge or conjecture
 b.  (as modifier): a science fiction writer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

science fiction
1929 (first attested in "Science Wonder Stories" magazine), though there is an isolated use from 1851; abbreviated form sci-fi is from 1955.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

science fiction definition


Works of fiction that use scientific discoveries or advanced technology — either actual or imaginary — as part of their plot. Jules Verne and H. G. Wells were early writers of science fiction. More recent ones are Isaac Asimov and Ray Bradbury.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Food of the future used to be the stuff of science fiction.
If the present state of imaginary music seems bleak, science fiction suggests a
  brighter future.
It is equally conceivable that human space flight, long the stuff of science
  fiction, will return to fantasy.
Once the fantasy of science fiction, battlefield robots are now a reality.
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