(computing) A computer memory chip that stores values but does not allow updates, in which the values are nonvolatile in that they are retained even when the computer is unpowered.

a compact disk that is used with a computer (rather than with an audio system); a large amount of digital information can be stored and accessed but it cannot be altered by the user

(computer science) a read-only memory chip that can be erased by ultraviolet light and programmed again with new data

(computer science) memory whose contents can be accessed and read but cannot be changed

(computer science) a file that you can read but cannot change

a memory chip providing read-only memory

(electronics) A type of read-only memory which can be written to once (write once, read many memory/WORM), and thereafter becomes fixed in value.