cross-section
noun [ C ]
uk/ˈkrɒssekʃən/ ussomething that has been cut in half so that you can see the inside, or a model or picture of this:
This diagram shows a cross-section of the building and the layout of offices on all four floors.
a small group which represents all of the different types within the total group:
The study examined data from 4,100 adults representing a cross-section of the U.S. population.