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microprocessor (n.)

"miniaturized processor capable of serving as the central processing unit of a computer," by 1970, from micro- + processor.

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Definitions of microprocessor from WordNet

microprocessor (n.)
integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system;
a microprocessor functions as the central processing unit of a microcomputer
a disk drive contains a microprocessor to handle the internal functions of the drive
From wordnet.princeton.edu