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n.
a written explanation or criticism or illustration that is added to a book or other textual material; "he wrote an extended comment on the proposal"
n.
anything (such as a document or a phonograph record or a photograph) providing permanent evidence of or information about past events; "the film provided a valuable record of stage techniques"
n.
an extended communication (often interactive) dealing with some particular topic; "the book contains an excellent discussion of modal logic"; "his treatment of the race question is badly biased"
n.
a record or narrative description of past events; "a history of France"; "he gave an inaccurate account of the plot to kill the president"; "the story of exposure to lead"