Definition of The X-Files from the Oxford Advanced Learner's Dictionary

 

The X-Files

 
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a popular US television series that began in 1993 and is widely shown in other countries. It is about two members of the FBI, Agent Mulder (David Duchovny) and Agent Scully (Gillian Anderson), who investigate mysterious events suggesting other forms of life in space. There has also been a film, The X-Files (1998).