Supervenience is a term used in philosophy to describe the relationship between two sets of properties: the lower-level properties that make up the physical world and the higher-level properties that are emergent from them. Synonyms for supervenience include dependence, determination, and compositionality. Some philosophers also use the terms reduction, emergence, and ontological dependence to describe similar concepts. However, there are subtle differences between these terms, and their precise meanings are often the subject of debate in philosophical discussions. Ultimately, all of these terms refer to the idea that higher-level properties are dependent on the lower-level properties from which they emerge.