- the act of deranging.
- disarrangement; disorder.
- the act of deranging or state of being deranged
- disorder or confusion
- psychiatry a mental disorder or serious mental disturbance
1737, “disturbance of regular order,” from French dérangement (17c.), from déranger (see derange). Of mental order, from 1800.
- Disturbance of the regular order or arrangement of parts in a system.
- Mental disorder; insanity.