operating system

noun Computers.

1. the collection of software that directs a computer’s operations, controlling and scheduling the execution of other programs, and managing storage, input/output, and communication resources. Abbreviation: OS

noun

1. the set of software that controls the overall operation of a computer system, typically by performing such tasks as memory allocation, job scheduling, and input/output control

1. Software designed to handle basic elements of computer operation, such as sending instructions to hardware devices like disk drives and computer screens, and allocating system resources such as memory to different software applications being run. Given uniformly designed operating systems that run on many different computers, developers of software do not need to concern themselves with these problems, and are provided with a standard platform for new programs.

The software that allows computer users to run applications with the hardware of a specific system. Microsoft® Windows® or Apple® Computer’s OS are examples of operating systems.