based on custom rather than documentation; "an unwritten law"; "rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence
the form in which a text (especially a printed book) is published
an issue of a newspaper; "he read it in yesterday's edition of the Times"
all of the identical copies of something offered to the public at the same time; "the first edition appeared in 1920"; "it was too late for the morning edition"; "they issued a limited edition of Bach recordings"