Definition of science fiction noun from the Oxford Advanced Learner's Dictionary

 

science fiction

 noun
noun
BrE BrE//ˌsaɪəns ˈfɪkʃn//
 
; NAmE NAmE//ˌsaɪəns ˈfɪkʃn//
 
(informal sci-fi)(abbreviation SF)[uncountable] Types of film
 
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a type of book, film/movie, etc. that is based on imagined scientific discoveries of the future, and often deals with space travel and life on other planets See related entries: Types of film
See the Oxford Advanced American Dictionary entry: science fiction