1) Computer memory 
Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices. Data stored in ROM can only be modified slowly, with difficulty, or not at all, so it is mainly used to distribute firmware (software that is very closely tied to specific hardware, and unlikely to need frequent updates). Strictly, read-only memory ...
(from the article `computer memory`) Nonvolatile semiconductor memories, unlike SRAM and DRAM, do not lose their contents when power is turned off. Some nonvolatile memories, such as ...
memory in which the contents are intended to be read only and not to be altered during normal operation
Information hard-wired into chips. Used for the BIOS and in many I/O devices. Abbreviated as ROM.
[n] - (computer science) memory whose contents can be accessed and read but cannot be changed
ROM noun (computer science) memory whose contents can be accessed and read but cannot be changed