/ dɪsˈɔːdə(r); NAmE -ˈɔːrd-/ noun
1.
[ U ] an untidy state; a lack of order or organization :
His financial affairs were in complete disorder .
The room was in a state of disorder.
OPP order
2.
[ U ] violent behaviour of large groups of people :
an outbreak of rioting and public disorder
—compare order (3)
3.
[ C , U ] an illness that causes a part of the body to stop functioning correctly :
a blood / bowel, etc. disorder
eating disorders
He was suffering from some form of psychiatric disorder.
➡ note at disease
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WORD ORIGIN
late 15th cent. (as a verb): alteration, influenced by order , of earlier disordain , from Old French desordener , ultimately based on Latin ordinare ordain.