Definition: The word you're referring to is "deuteronomy," which comes from the Hebrew Bible and means "law." It's a phrase used to refer back to previous laws and instructions in one document, such as Deuteronomy 1:6, which outlines the legal requirements for Israelites living under Joshua.
An example of using it would be: "In Deuteronomy 1:6, God commands that all Israelites must go through a rigorous process of worshiping Him on Mount Sinai." This implies that this law is a foundational part of the religion or Jewish culture that binds the people to God.