idiosyncrasy

Definition of Idiosyncrasy in English :

1. foible, idiosyncrasy, mannerism

a behavioral attribute that is distinctive and peculiar to an individual

WordNet Lexical Database for English. Princeton University. 2010.

Idiosyncrasy

noun plural -sies

1.

a tendency, type of behaviour, mannerism, etc, of a specific person; quirk

2.

the composite physical or psychological make-up of a specific person

3.

an abnormal reaction of an individual to specific foods, drugs, or other agents

nounWord forms: plural ˌidioˈsyncrasies

1.

the temperament or mental constitution peculiar to a person or group

2.

any personal peculiarity, mannerism, etc.

3.

an individual reaction to a drug, food, etc. that is different from the reaction of most people

n. pl. id·i·o·syn·cra·sies

1. A structural or behavioral characteristic peculiar to an individual or group.

2. A physiological or temperamental peculiarity.

3. An unusual individual reaction to food or a drug.