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English definition of “documentary”

documentary

noun [C]  /ˌdɑk·jəˈmen·tə·ri/ us  
a film or television or radio program that gives information about a subject and is based on facts: a documentary on animal communication

documentary

adjective [not gradable] /ˌdɑk·jəˈmen·tə·ri/
consisting of official documents or other written or printed material: documentary evidence
(Definition of documentary from the Cambridge Academic Content Dictionary © Cambridge University Press)
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