What does "delirium" mean?

Delirium: Strong excitement; wild enthusiasm; madness. The popular delirium [of the French Revolution] at first caught his enthusiastic mind. W. Irving. The delirium of the preceding session (of Parliament). Motley. Delirium tremens (. Etym: [L., trembling delirium] (Med.), a violent delirium induced by the excessive and prolonged use of intoxicating liquors. -- Traumatic delirium (Med.), a variety of delirium following injury. See Insanity.