A computer that carries out computations on one number at a time.
A CPU that performs computations on one number or set of data at a time. Most computers have scalar CPUs. A scalar processor is known as a "single instruction stream single data stream" (SISD) CPU. Contrast with vector processor. See scalar.
Coupled with computations in the same instruction bundle, the result is both dramatically higher performance and dramatically lower power consumption compared to the same task being run on a conventional single-issue scalar processor with only a traditional system bus interface.