- noun a person who makes sure that equipment is always working correctly
- noun a section of a computer operating system that regulates the use of peripherals and the operations undertaken by the CPU
- The software which runs all the software and hardware of a computer. It is the first program the computer loads when powered on, remains memory resident, and continuously controls and allocates all resources. Without it, for example, a computer can not recognize input, such as that from a keyboard, it can not process, as the supervisor controls the use of the CPU, nor can it provide an output, as it manages all peripherals including the monitor. Also called operating system, or executive. When disk-based, also called disk operating system.