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English definition of “delirium”

delirium

noun [U] uk   /dɪˈlɪr.i.əm/ us  
a state of being unable to think or speak clearly because of fever or mental confusion: fever accompanied by deliriumFevers and infectious diseasesColds and flu a state of extreme excitement or happiness: I've never seen such delirium at a tennis match before.Excitement, interest, energy and enthusiasmPleasure and happiness
(Definition of delirium from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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