Idiosyncrasy
An idiosyncrasy is an unusual feature of a person (though there are also other uses, see below). It can also mean an odd habit. The term is often used to express eccentricity or peculiarity. A synonym may be “quirk”.
Idiocentric (adjective)
Characterized by or denoting interest centered upon oneself or one’s own ways, rather than upon others or the ways of others; self-centered.
Idiocentric (adjective)
Deviating from the norm; eccentric.
Idiosyncrasy (noun)
A behavior or way of thinking that is characteristic of a person.
Idiosyncrasy (noun)
A language or behaviour that is particular to an individual or group.
Idiosyncrasy (noun)
A peculiar individual reaction to a generally innocuous substance or factor.
Idiosyncrasy (noun)
A peculiarity that serves to distinguish or identify.
“He mastered the idiosyncrasies of English spelling and speech.”
Idiosyncrasy (noun)
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”
Idiosyncrasy (noun)
a distinctive or peculiar feature or characteristic of a place or thing
“the idiosyncrasies of the prison system”
Idiosyncrasy (noun)
an abnormal physical reaction by an individual to a food or drug.