Definition from Wiktionary, the free dictionary
documentary (not comparable)
- of, related to, or based on documents.
- which serves to document (record and:or illustrate) a subject.
- (of a film, book etc) presented objectively without the insertion of fictional matter.
of, related to or based on documents/that serves to document something
presented objectively without the insertion of fictional matter
- A film, TV program, publication etc. which presents a social, political, scientific or historical subject in a factual or informative manner.
Derived terms 
terms derived from documentary (noun)
Related terms