madness (Noun) — Obsolete term for legal insanity.
madness (Noun) — An acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain.
madness (Noun) — A feeling of intense anger. ex. "hell hath no madness like a woman scorned"
madness (Noun) — The quality of being rash and foolish. ex. "trying to drive through a blizzard is the height of madness"
madness (Noun) — Unrestrained excitement or enthusiasm. ex. "poetry is a sort of divine madness"