Magnetism

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early 17th century: from modern Latin magnetismus, from Latin magneta (see magnet).

wiktionary

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magnet +‎  -ism

etymonline

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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.