GNU Collaborative International Dictionary of English

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Found one definition

1.       
   science fiction (sīˈens fĭkˈshŭn), n. [science fiction.] A genre of fiction in which scientific and technological issues feature prominently, especially including scenarios in which speculative but unproven scientific advances are accepted as fact, and usually set at some time in the future, or in some distant region of the universe.
   
   [PJC]