main memory

noun Computers.
program-addressable storage that is directly controlled by and generally contained in the CPU: except for cache storage, the fastest type of storage available to any computer system.
Also called main storage, primary memory.
Formerly core memory.
Compare real storage.
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World English Dictionary
main memory
 
n
the central memory-storage facility in a computer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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FOLDOC
Computing Dictionary

main memory definition

storage, architecture
The storage device used by a computer to hold the currently executing program and its working data. A modern computer's main memory is built from random-access memory integrated circuits. In the old days ferrite core memory was one popular form of main memory, leading to the use of the term "core" for main memory.
Computers have several other sorts of memory, distinguished by their access time, storage capicity, cost, and the typical lifetime or rate of change of the data they hold. Registers in the CPU are fast, few, expensive and typically change every few machine instructions. Other kinds are cache, PROM, magnetic disk (which may be used for virtual memory) and magnetic tape.
(1996-11-04)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The last thing you want is to make an unappealing attraction their main memory
  of their last vacation.
It's the speed of light that causes designers fits as they try and remove
  latency from main memory and cache accesses.
It is the part of the operating system that loads first, and it remains in main
  memory.
They have less main memory bandwidth which can limit the performance for
  applications that do not reuse data cache well.
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