IPA: /dɪˈreɪndʒmənt/
KK: /dɪˈreɪndʒmənt/
A state of being disturbed or upset, often referring to mental or emotional disorder.
The sudden loss of her job caused a derangement in her usual routine.
Derangement → It is formed from "de-" (meaning down or away) and "range" (from Old French *rengier*, meaning to arrange or put in order) and the suffix "-ment" (indicating the action or result of). The word "derangement" refers to the action of putting something out of order or causing disorder.
Think of 'down' or 'away' ('de-') from the usual 'arrangement' ('range') — that's why derangement means causing disorder.