Final answer:
If the keyword INSTANTIABLE is left out, it means that the class being defined cannot be instantiated or objects of that class cannot be created.
Step-by-step explanation:
If the keyword INSTANTIABLE is left out, it means that the class being defined cannot be instantiated, or in other words, objects of that class cannot be created.
This keyword is often used in object-oriented programming languages like Java to indicate that a class can be instantiated and objects can be created based on that class. When the INSTANTIABLE keyword is omitted, the class becomes an abstract class, which means it can only serve as a superclass for other classes and cannot be directly used to create objects.
For example, consider a class Animal that is defined as INSTANTIABLE. Objects of the Animal class, such as a dog or a cat, can be created. However, if the keyword is left out and the class is defined as abstract, you would not be able to create objects of the Animal class directly.