An instance of things occurring is referred to as a 'CASE'. It is a term used in many different contexts, such as law, medicine, and linguistics. In law, a CASE is a dispute between two or more parties that is brought before a court for resolution. In medicine, a CASE is a patient's medical history, diagnosis, and treatment. In linguistics, a CASE is a grammatical category that indicates the relationship between a noun and other words in a sentence.