[mahy-kroh-pros-es-er, ‐uh-ser; especially British ‐proh-ses-er, ‐suh-ser]
an integrated computer circuit that performs all the functions of a CPU.

1965–70; micro- + processor

microprocessing, noun
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World English Dictionary
microprocessor (ˌmaɪkrəʊˈprəʊsɛsə)
computing a single integrated circuit performing the basic functions of the central processing unit in a small computer

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
microprocessor   (mī'krō-prŏs'ěs-ər)  Pronunciation Key 
An integrated circuit that contains a processor, such as a central processing unit.
The American Heritage® Science Dictionary
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