Noun
(theology) The six days in which God created the world according to the biblical creation story.
(theology) The narrative in the Book of Genesis describing the events of the hexameron.
(literature) A treatise concerning the biblical creation story.
Source: en.wiktionary.orgAelfric wrote two neo-scientific works, Hexameron and Interrogationes Sigewulfi, dealing with the stories of Creation. Source: Internet