You probably seeing this word used in terms like substantive law, substantive issues, or substantive orders, and it is used to identify aspects of these things (be they laws, legal issues, or court orders) that deal with the legal rights and duties of the parties involved in a case. Substantive law defines and regulates the rights and obligations of individuals, as opposed to procedural law, which outlines the methods and means by which substantive law is made and administered. In family law, substantive issues often involve matters such as guardianship and parenting arrangements relating to children, support, and the division of property. A substantive order from a judge will be a decision about a substantive issue, versus a procedural order which will be about how steps in the litigation should.