Etymology
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magnetism (n.)

1610s, "the characteristic properties of a magnet," from Modern Latin magnetismus (see magnet + -ism). Figurative sense of "personal charm, attractive power or influence" is from 1650s; in the hypnotic sense it is from Mesmer (see mesmerism). Meaning "science of magnets and magnetic phenomena" is by early 19c.

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Definitions of magnetism

magnetism (n.)
attraction for iron; associated with electric currents as well as magnets; characterized by fields of force;
Synonyms: magnetic attraction / magnetic force
magnetism (n.)
the branch of science that studies magnetism;
Synonyms: magnetics
From wordnet.princeton.edu