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Definition: Capable of being retrieved (read) but not changed (written). A read-only file or document can be displayed or printed but not altered in any way. Read-only memory (ROM) holds programs that cannot be changed; a read-only storage medium, such as CD-ROM, can be played back but cannot be used for recording information.
Source: Microsoft Computer Dictionary. 5th ed. Redmond, Wash. : Microsoft Press, 2002. Print.