1. The extent to which a piece of hardware will tolerate electrical interference from other equipment, and will interfere with other equipment.
2. The capability of electronic equipment or systems to be operated in the intended electromagnetic environment at design levels of efficiency.
3. The ability of electronic equipment and systems to operate in the proximity of electromechanical devices, without causing or suffering unacceptable degradation in output or performance.
4. The capacity of an appliance or circuit to function correctly in its intended electromagnetic environment without transmitting unwanted signals to adjacent equipment or receiving unwanted interference from nearby sources.