English▸ noun
(plural idiosyncrasies)
(usually idiosyncrasies) a mode of behavior or way of thought peculiar to an individual: one of his little idiosyncrasies was always preferring to be in the car first.
▪ a distinctive or peculiar feature or characteristic of a place or thing:
the idiosyncrasies of the prison system.
▪ Medicine an abnormal physical reaction by an individual to a food or drug.
– ORIGIN early 17th century (originally in the sense ‘physical constitution peculiar to an individual’): from Greek idiosunkrasia, from idios ‘own, private’ + sun ‘with’ + krasis ‘mixture’.