A computer/device with a single processor on the die for the CPU and has a single CPU.
I am not sure but I THINK all processors today are actually manufactured to be multiprocessors (multiple processors on a single die). The single processors are either chips that all but one of the processors failed testing (essentially what the garment industry would call a factory second) or chips that have had all but one of the processors on the chips disabled or some combination of the two.
