Severity means how serious, harsh, or extreme something is. A paper cut has low severity, but a broken bone has high severity. When weather forecasters warn about the severity of an approaching storm, they're describing how dangerous and damaging it might be.

The word helps us measure and compare how bad things are. A teacher might reduce the severity of a punishment if she learns a student made an honest mistake rather than misbehaving on purpose. Doctors assess the severity of an illness to decide which treatment works best: a mild cold requires rest, but a severe infection might need antibiotics or even hospitalization.

Severe is the adjective form of severity. A severe winter brings dangerously cold temperatures and heavy snow. A severe consequence is one that really matters and can't be ignored. When someone uses a severe tone of voice, they sound serious and stern, not playful or casual.

The word appears often in discussions of rules and consequences. Schools publish codes of conduct explaining how the severity of the misbehavior determines the severity of the response. Breaking a minor rule might mean a warning, while a severe violation leads to serious consequences. Understanding severity helps you grasp how serious any situation really is and respond appropriately.