1. The magnetic field around a wire or other conductor when, and only when, current passes through it: "Electromagnetism consists of electric fields and magnetic fields and both fields are simply different aspects of electromagnetism, and so they are intrinsically related because a changing electric field generates a magnetic field; and a changing magnetic field generates an electric field."
2. The branch of physics dealing with the observations and laws relating electricity to magnetism, and with magnetism produced by an electric current: "The environmental electromagnetism indicates not only the fact that we live our lives in a constant state of bombardment of electromagnetism, but also that all of the energy from all of the collective devices in use in the world today, is currently going to waste."
3. Magnetism produced by a current of electricity: "Electromagnetism is all around us because in addition to natural sources; such as lightning, it's also given off by every electronic gadget, device, or machine that people make."
4. The interaction between magnetism and electricity, and the phenomena produced by this interaction and the scientific study and applications of such observable events: "Electricity and magnetism were long thought to be separate forces until the work of Michael Faraday and James Clerk Maxwell showed that the phenomena associated with lightning and magnets were both caused by electromagnetism which is considered to be one of the four fundamental forces of nature."