1) Central processing unit 
(from the article `central processing unit`) The control unit of the central processing unit regulates and integrates the operations of the computer. It selects and retrieves instructions from ... ...numbers to be added and outputs corresponding to the bits of the sum. The arrangement of wires and transistors that link inputs to outputs...
A component of a CPU that decodes and executes all instructions to the computer.
Component of the central processing unit (CPU) that decodes, synchronizes, and executes program instructions
the part of a CPU that interprets the instructions in programs and directs the operation of the entire system. · controller (def. 5).