The term 'Establish by Law' can be broken down into two crossword solutions: ENACT (5 letters) and ORDAIN (6 letters). ENACT is defined as to make something legally binding, while ORDAIN is defined as to officially order or declare something. Together, these two words mean to create a law or set of rules that are legally binding. This is often done by governments or other organizations in order to ensure that certain standards are met and followed.