Magnetism (noun)

1. The physical phenomenon of attraction or repulsion between certain substances, especially certain metals and magnets.
2. The branch of science that studies this phenomenon, including the properties and behavior of magnets and the effects of magnetism on matter.

Origin:

From french magnétisme, from latin magnetes, from ancient greek μαγνήτης (magnētēs, "magnet"), from μαγνητός (magnētos, "attracted by lodestones"), from μαγνήσσω (magnēssō, "to act as a magnet").

Examples:

1. The compass needle pointed north because of Earth's magnetism.
2. The magnetic field around the Earth protects us from harmful solar radiation.
3. The iron filings lined up in the pattern of the magnet's magnetic field.
4. Magnetism plays a crucial role in many technological applications.
5. He studied magnetism in graduate school.