Source : Webster's Revised Unabridged Dictionary (1913)

Delirium \De*lir"i*um\, n. [L., fr. delirare to rave, to wander
   in mind, prop., to go out of the furrow in plowing; de- +
   lira furrow, track; perh. akin to G. geleise track, rut, and
   E. last to endure.]
   1. (Med.) A state in which the thoughts, expressions, and
      actions are wild, irregular, and incoherent; mental
      aberration; a roving or wandering of the mind, -- usually
      dependent on a fever or some other disease, and so
      distinguished from mania, or madness.

   2. 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).                          --Morley.

   {Delirium tremens}. [L., trembling delirium] (Med.), a
      violent delirium induced by the excessive and prolonged
      use of intoxicating liquors.

Source : WordNet®

delirium
     n 1: state of violent mental agitation [syn: {craze}, {frenzy}, {fury},
           {hysteria}]
     2: a usually brief state of excitement and mental confusion
        often accompanied by hallucinations

Source : Free On-Line Dictionary of Computing

Delirium
     
        An embedding coordinate language for parallel programming,
        implemented on {Sequent Symmetry}, {Cray}, {BBN Butterfly}.
     
        ["Parallel Programming with Coordination Structures", S. Lucco
        et al, 18th POPL, pp.197-208 (1991)].