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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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for main memory

main memory

the central memory-storage facility in a computer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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main memory in Technology
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.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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