Definition of special effects noun from the Oxford Advanced Learner's Dictionary

 

special effects

 noun
noun
BrE BrE//ˌspeʃl ɪˈfekts//
 
; NAmE NAmE//ˌspeʃl ɪˈfekts//
 
(also SFX)[plural]
 
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unusual or exciting pieces of action in films/movies or television programmes, that are created by computers or clever photography to show things that do not normally exist or happen
See the Oxford Advanced American Dictionary entry: special effects