a computer with processing and storage capabilities smaller than those of a mainframe but larger than those of a microcomputer, used by small businesses, in manufacturing processes, in scientific research, etc.
min·i·com·put·er (mĭn'ē-kəm-pyōō'tər) n. A mid-sized computer, usually fitting within a single cabinet about the size of a refrigerator, that has less memory than a mainframe.