- The act of deranging or putting out of order, or the
state of being deranged; disarrangement; disorder; confusion;
especially, mental disorder; insanity.
Meaning of 'derangement' (Princeton's WordNet)
1 . derangement
[ n]
Meaning (1): - the act of disturbing the mind or body
Example in sentence:
his carelessness could have caused an ecological upset;
she was unprepared for this sudden overthrow of their normal way of living