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main memory

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noun Computers.
  1. 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.
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Compare real storage.
Also called main storage, primary memory.Formerly core memory.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for main memory

main memory

noun
  1. the central memory-storage facility in a computer
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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