Definition of main memory in US English:

main memory

noun

Computing
  • The main storage region of a computer, to which the central processor has immediate or direct access.

    ‘most code is executed from main memory’
    • ‘Each second, up to 6.4 GB of data can be exchanged between the main memory and processor.’
    • ‘You can retrieve up-to-date technical data any time, like main memory consumption, storage space, disk activity, communication on network interfaces, etc.’
    • ‘The amount of main memory used by Java applications complicates their deployment.’
    • ‘The comparable trend in other servers is simply to add more main memory, which can execute programs.’
    • ‘Moving the memory controller into the CPU gives it direct access to main memory.’
    • ‘The board can manage up to 4 GB of main memory.’
    • ‘If the desired code isn't in the cache, it must be read from memory (probably main memory).’
    • ‘Beyond this main memory are disk drives, which store even larger amounts of information.’
    • ‘Most inexpensive PCs use what is called integrated graphics, which shares your main memory.’
    • ‘It's not necessary for you to be able to process all the data in main memory.’