Maybe. For my degrees and certs, we learned the definitions they taught. We did not get to define things based on our own opinions of how we thought they should be defined.
As far as defining something as itself, there are lots of products that work that way. A battery, for example, can be made up of a single cell, or multiple cells. And those cells can be totally discrete (separate) like those found in a 2
D-Cell flashlight, or integrated into a single housing like a SLA (sealed lead-acid) battery found in a UPS or your car battery.
For example. A single cell
AA battery is a battery. It is also a single cell.
Strap two AAs cells together, and you still have just one battery. Put 4 together, you still have a single battery.
So 4 batteries make 1 battery. And that is true if you strap all 4 in series to make one 6VDC battery or in parallel to make one 1.5VDC battery, or in series/parallel to make one 3VDC. It is still 4 batteries that are cells in 1 battery.
Note a
SLA battery. It is made up of 6 cells. But together they make 1 battery. Inside a UPS, there may be two of those SLA batteries. But strapped together, they make just one battery and individually, they are now acting as cells.
A CPU can have 1 core and still be a CPU. A CPU can have 4 cores and still be a (as in 1) CPU. Each of those cores be be tasked to perform separate tasks at the same time, in effect, as 4 separate CPUs, or they can be tasked to work together as one more powerful CPU to perform a single task more quickly. Either way, on a dual or quad core processor die, that die is "physically" divided into those separate cores. They are NOT "virtual" dividing lines (as HT might be described). And they can even be disabled individually as AMD did in the past with some of their quads to make 3 core processors.