Final answer:
A 'landmark case' refers to a court case that has had a significant impact on the interpretation or application of the law, establishing new legal principles and setting important precedents for future cases.
Step-by-step explanation:
When a court case is referred to as a 'landmark case,' it means that the case has had a significant impact on the interpretation or application of the law. Landmark cases often establish new legal principles and set important precedents for future cases. These cases are usually heard by higher courts, such as the supreme court, and can shape the legal landscape of a country or jurisdiction.