The state or quality of being delirious; a condition of mental confusion and excitement.
From Latin 'delirare' (to rave, go mad), combining 'de-' (away from) and 'lira' (furrow), metaphorically meaning to go off the straight line of reason. The suffix '-acy' indicates a state or condition.
The word 'delirious' comes from the image of a plow going off its furrow—Romans thought madness was like losing your mental track, which is why they called it literally 'off the furrow.' It's a beautiful visual metaphor for confusion.
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