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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.
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
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