de ‧ lir ‧ i ‧ um /dɪˈlɪriəm/ BrE AmE noun
[ Date: 1500-1600 ; Language: Latin ; Origin: delirare 'to leave a straight line, be mad' , from lira 'line cut in the ground' ]
1 . [uncountable] a state in which someone is delirious, especially because they are very ill:
Before she died she had fits of delirium.
2 . [singular, uncountable] extreme excitement