The document discusses the doctrine of severability, which refers to separating the valid parts of a statute from any invalid or unconstitutional parts. It provides the Latin and legal definitions of severability. Constitutionally, severability means that if an inappropriate part of a statute can be separated from the valid constitutional parts, then only the inappropriate part will be declared void, not the entire statute. The document then discusses the doctrine of severability in the common law origins of several countries, including key cases. It outlines tests that courts use to determine whether severability applies and whether the valid and invalid parts of a statute can be separated.