idiosyncrasy
noun
[ ˌɪdɪə(ʊ)ˈsɪŋkrəsi ]
• a mode of behaviour or way of thought peculiar to an individual.
• "one of his little idiosyncrasies was always preferring to be in the car first"
• 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’.
