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The CPU Site: Everything you always wanted to know about CPUs
CPU World

Dictionary

processor (cpu) : the component of a computer system that performs the basic operations (as processing data) of the system, that exchanges data with the system’s memory or peripherals, and that manages the system’s other components — Webster

FOLDOC: Free Online Dictionary of Computing, Oxford, OneLook, Free Dictionary, Wiktionary, InfoPlease, Word Reference, Urban Dictionary

Glossary

Glossary of Computer and Internet Terms (PC.net)

Encyclopedia

Microprocessor is a computer processor which incorporates the functions of a computer’s central processing unit (CPU) on a single integrated circuit (IC), or at most a few integrated circuits. The microprocessor is a multipurpose, clock driven, register based, programmable electronic device which accepts binary data as input, processes it according to instructions stored in its memory, and provides results as output. Microprocessors contain both combinational logic and sequential digital logic. Microprocessors operate on numbers and symbols represented in the binary numeral system. The integration of a whole CPU onto a single chip or on a few chips greatly reduced the cost of processing power, increasing efficiency. Integrated circuit processors are produced in large numbers by highly automated processes resulting in a low per unit cost. Single-chip processors increase reliability as there are many fewer electrical connections to fail. — Wikipedia

Britannica, Columbia (Infoplease)