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English word documentary comes from Latin doceo, Latin instrumentum, Latin docere, and later Latin documentum (Instruction. Lesson. Warning.)
doceo (Latin)
(drama) I rehearse, present on stage. I teach, instruct; tell, inform; show, demonstrate.
instrumentum (Latin)
(collective) supply, provision. (general) paraphernalia, equipment. An instrument, tool, utensil. Records, documents.
docere (Latin)
documentum (Latin)
Instruction. Lesson. Warning.
document (English)
To furnish with documents or papers necessary to establish facts or give information.. To record in documents. (computing) A file that contains text.. (obsolete) An example for instruction or warning.. (obsolete) That which is taught or authoritatively set forth; precept; instruction; dogma.. An original or official paper used as the basis, proof, or support of anything else, including any [...]
documentaire (English)
documentary (English)
(of a film, book etc) Presented objectively without the insertion of fictional matter.. Of, related to, or based on documents.. Which serves to document (record and:or illustrate) a subject. A film, TV program, publication etc. which presents a social, political, scientific or historical subject in a factual or informative manner.