Electromagnetic interference

Electromagnetic interference or EMI is any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronic or electrical equipment. It can be induced intentionally, as in some forms of electronic warfare, or unintentionally, as a result of spurious emissions and responses, intermodulation products, and the like. It is also known as radio frequency interference.

Modified from original source: from Federal Standard 1037C and from the Department of Defense Dictionary of Military and Associated Terms