An enumerative definition is a way of describing something by listing all the things or parts that make it up. It's kind of like making a shopping list, but instead of groceries, you're listing everything that belongs to a certain category.
Let's say we want to make an enumerative definition of a fruit salad. Firstly, we'll think of all the different fruits that are in a typical fruit salad like strawberries, bananas, pineapples, kiwis, etc. We list all of these fruits one by one, making sure not to leave any out.
When we're done, we would have a complete list of all the fruits that go into a fruit salad. This list is an example of an enumerative definition.
So basically, an enumerative definition is a way to define something by providing a comprehensive list of all the things that it refers to. It's a helpful technique for when you need to describe something but don't want to leave anything out.