Origin: Greek suffix -ism
Electromagnetism has 3 different meanings across 1 category:
magnetism produced by an electric current
"electromagnetism was discovered when it was observed that a copper wire carrying an electric current can magnetize pieces of iron or steel near it"
the branch of physics concerned with electromagnetic phenomena
A unified fundamental force that combines the aspects of electricity and magnetism and is one of the four fundamental forces. (technically it can be unified with weak nuclear to form electroweak) Its gauge boson is the photon.