detective - definition and synonyms

noun [countable] 

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  1. 1
    a police officer whose job is to try to discover information about a crime so that the criminal can be caught
     Synonyms and related words
  2. 2
    someone who is paid by other people to find out information

    a detective agency

  3. 3
    [only before noun] a detective story or film is one in which a detective tries to solve a crime

    I’m reading a detective novel.