[sahy-fahy] Informal.
of or pertaining to science fiction: a writer of sci-fi books.

1950–55; by shortening Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sci-fi (ˈsaɪˌfaɪ)
short for science fiction

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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American Heritage
Abbreviations & Acronyms
science fiction
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The show borrows heavily from other sci-fi sources and the first episode was
  heavy on exposition.
You've done the rounds on the sci-fi convention circuit lately.
It's a dream of mine to be the sci-fi weirdo in some crazy cult movie.
Not only is this an old idea, but there is a fairly well known sci-fi novel
  about it.
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