Final answer:
Deferrals that cannot be overridden refer to programming features where a program delays the execution of a function until a certain condition is met. In some cases, such as finalizer deferral in Java, these deferrals cannot be changed or bypassed.
Step-by-step explanation:
In programming, a deferral is a feature that allows a program to delay the execution of a function until a certain condition is met. In some cases, there are deferrals that cannot be overridden, which means the program cannot change or bypass them. One example is a finalizer deferral in Java, where objects with finalizers are not eligible for garbage collection until the finalizer is executed.