For example:
* Course enrollment size: The number of students enrolled in a single course, like Biology 101.
* School enrollment size: The total number of students attending a particular school, like Oakwood Elementary.
* University enrollment size: The total number of students enrolled in all programs at a university, such as the University of California, Berkeley.
* Program enrollment size: The number of students enrolled in a specific program, such as a Master's in Computer Science.
The context is key to understanding what an enrollment size refers to.