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heptameron n. , [Greek ἑπταήμερος, neuter ἑπταήμερον, of seven days, < ἡμέρα day] a seven days' work; title of a collection of stories, represented (after the pattern of the Decameron of Boccaccio) to have been told on seven successive days, made by Queen Margaret of Navarre, a1549.