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1. A microchip that executes machine code stored in the main memory. It is the brain of the computer. Also called the Central Processing Unit or CPU.2. The data processing unit of a computer. Computers can be uniprocessing or multiprocessing. A uniprocessor system has only one run queue from which the processor can pick up threads for execution. In a multiprocessing system, however, more than one processor is available for the distribution of threads.