noun, plural deliriums, deliria [dih-leer-ee-uh] .
Pathology. a more or less temporary disorder of the mental faculties, as in fevers, disturbances of consciousness, or intoxication, characterized by restlessness, excitement, delusions, hallucinations, etc.
a state of violent excitement or emotion.

1590–1600; < Latin dēlīrium frenzy, equivalent to dēlīr(āre) (see deliration) + -ium -ium

semidelirium, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
delirium (dɪˈlɪrɪəm)
n , pl -liriums, -liria
1.  a state of excitement and mental confusion, often accompanied by hallucinations, caused by high fever, poisoning, brain injury, etc
2.  violent excitement or emotion; frenzy
[C16: from Latin: madness, from dēlīrāre, literally: to swerve from a furrow, hence be crazy, from de- + līra ridge, furrow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590s, from L. delirium "madness," from deliriare "be crazy, rave," lit. "go off the furrow," a plowing metaphor, from phrase de lire (de "off, away" + lira "furrow").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

delirium de·lir·i·um (dĭ-lēr'ē-əm)
n. de·lir·i·ums or de·lir·i·a (-ē-ə)
A temporary state of mental confusion resulting from high fever, intoxication, shock, or other causes, and characterized by anxiety, disorientation, memory impairment, hallucinations, trembling, and incoherent speech.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

Delirium definition

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)].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Mallory himself slides into full-fledged dementia and delirium as he battles
  the guerrillas, the militia and the forces of nature.
As a new century begins, we have begun to awaken from this delirium.
As 300 or more runs are not infrequent in a cricket game, it was in a state of
  delirium we took our chance at the bat.
The disorder is called acute confusional state or delirium.
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