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electromagnetism (n.)

also electro-magnetism, 1821; see electro- + magnetism.

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Definitions of electromagnetism from WordNet

electromagnetism (n.)
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
electromagnetism (n.)
the branch of physics concerned with electromagnetic phenomena;
Synonyms: electromagnetics
From wordnet.princeton.edu