Deuteronomy Syllabification: (Deu·ter·on·o·my)Pronunciation: /ˌd(y)o͞otəˈränəmē/Definition of Deuteronomy the fifth book of the Bible, containing a recapitulation of the Ten Commandments and much of the Mosaic law. Deuteronomy in other Oxford dictionaries Definition of Deuteronomy in the British & World English dictionary