derangement

noun

1. the act of deranging.
2. insanity.
3. disarrangement; disorder.

noun

1. the act of deranging or state of being deranged
2. disorder or confusion
3. psychiatry a mental disorder or serious mental disturbance

n.

1737, “disturbance of regular order,” from French dérangement (17c.), from déranger (see derange). Of mental order, from 1800.

n.

1. Disturbance of the regular order or arrangement of parts in a system.
2. Mental disorder; insanity.