sci-fi

[ sahy-fahy ]
/ ˈsaɪˈfaɪ /
Informal.

adjective

of or relating to science fiction: a writer of sci-fi books.

noun

Origin of sci-fi

First recorded in 1950–55; by shortening
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for sci-fi

sci-fi

/ (ˈsaɪˌfaɪ) /

noun

short for science fiction
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