derangement JUST WRITTEN FOR YOU
/ˌdɛr.ən(d)ʒmənt/ · der·an·gment
noun
- A state of mental disturbance; insanity or madness. The doctor diagnosed him with a severe derangement that required immediate treatment.
- A disorder or disruption of the normal arrangement or order of something. The derangement of the gears caused the clock to run erratically.
- In combinatorics, a permutation of a set in which no element appears in its original position. The problem asked for the number of derangements of a five‑letter word.
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Did you know? The mathematical concept of a derangement was first studied by Pierre de Montmort in 1708, long before the word became common in psychology.