A state of mental disturbance or disorder. The patient's derangement was evident in his erratic behavior and speech.
A disruption or disorder in a system or process. The derangement of the supply chain caused significant delays in product delivery.
In combinatorics, a permutation of a set in which none of the elements appears in its original position. Counting derangements helps in solving problems like the number of ways to hand back hats so that no one receives their own.
The act or process of deranging or putting something out of order. The derangement of the filing system made it impossible to locate any documents.