n. a single computer instruction which symbolizes, and is converted at the time of program execution or by a compiler into, a series of instructions in the same computer language.n. A keystroke (or combination of keystrokes) which symbolizes and is replaced by a series of keystrokes; -- a convenient feature of some advanced programs, such as word processors or database programs, which allows a user to rapidly execute any series of operations which may be performed multiple times. Such macros may typically be defined by the program user, without rewriting or recompiling the program.adj. very large in scale or scope or capability.