noun
main memory; main storage
Technical term in computing for the primary working memory directly accessible by the CPU, as opposed to secondary storage.
主記憶の容量が大きいほど、多くのプログラムを同時に実行できる。
The larger the main memory capacity, the more programs can be run simultaneously.
Compound of 主 (main) and 記憶 (memory/storage), a straightforward technical calque from English.