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[Middle English, from Old English gemǣdde, past participle of * gemǣdan, to madden, from gemād, insane.]

adjective: mad·der, mad·dest.

Angry; resentful. See synonyms at angry

Suffering from a disorder of the mind; insane.

Temporarily or apparently deranged by violent sensations, emotions, or ideas: mad with jealousy.

Lacking restraint or reason; foolish: I was mad to have hired her in the first place.

Feeling or showing strong liking or enthusiasm: mad about sports.

Marked by extreme excitement, confusion, or agitation; frantic: a mad scramble for the bus.

Boisterously gay; hilarious: had a mad time.

Affected by rabies; rabid.

tr. & intr.v.: mad·ded, mad·ding, mads.

To make or become mad; madden.

idioms

like mad

Wildly; impetuously: drove like mad. To an intense degree or great extent: worked like mad; snowing like mad.

mad as a hatter

Crazy; deranged.

derivatives

mad’dish

adjective

MAD (măd)

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abbreviation

mutual assured destruction

A term used during the Cold War between the US and its allies and the USSR and its allies. It meant that no one side could win a war by sudden attack because a system had been devised that was certain to partially survive the first attack and to retaliate with enough force to obliterate the attacker.

The US and USSR achieved “mutually assured destruction” by basing their nuclear weapons in a “triad”, that is, in three separate delivery systems – aircraft, missiles, and submarines.

The “MAD” doctrine meant hydrogen bombs moving position in the air, undersea, and underground at all times to ensure that enough of them were certain to survive a first strike and to then obliterate the first striker. “Mad,” indeed.

noun, verb, mad·ded, mad·ding.

–adjective

1. mentally disturbed; deranged; insane; demented.

2. enraged; greatly provoked or irritated; angry.

3. (of animals)

a. abnormally furious; ferocious: a mad bull.

b. affected with rabies; rabid: a mad dog.

4. extremely foolish or unwise; imprudent; irrational: a mad scheme to invade France.

5. wildly excited or confused: frantic: mad haste.

6. overcome by desire, eagerness, enthusiasm, etc.; excessively or uncontrollably fond; infatuated: He’s mad about the opera.

7. wildly gay or merry; enjoyably hilarious: to have a mad time at the Mardi Gras.

8. (of wind, storms, etc.) furious in violence: A mad gale swept across the channel.

–noun

9. an angry or ill-tempered period, mood, or spell: The last time he had a mad on, it lasted for days.

–verb (used with object)

10. Archaic. to make mad.

–verb (used without object)

11. Archaic. to be, become, or act mad.

—Idioms

12. like mad, Informal. with great haste, impulsiveness, energy, or enthusiasm: She ran like mad to catch the bus.

13. mad as a hatter, completely insane.

http://dictionary.reference.com/browse/mad

Except you are talking from another perspective, and it that case should specify in what context you are asking.