Documentary
来自Big Physics
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early 19th century: from document + -ary1.
wiktionary
From French adjective and (hence) noun documentaire, from document, from Latin documentum.
etymonline
documentary (adj.)
1788, "pertaining to or derived from documents," from document (n.) + -ary. Meaning "factual, meant to provide a record of something" is by 1921, originally in reference to film, from French film documentaire (by 1919). The noun (short for documentary film) is attested by 1935.
