- A momentary high-intensity burst of electromagnetic energy, such as that produced by a nuclear detonation, or lightning. This energy is distributed along a wide interval of frequencies. Such a pulse is capable of severely disrupting or destroying electrical and electronic devices, such as computers and communications equipment. Its abbreviation is EMP.
- noun a surge of electromagnetic radiation given off by a nuclear explosion, which causes electrical equipment (such as radios, vehicle batteries, etc.) to stop working.