Idiosyncrasy comes from the Greek word idiosynkrasia, meaning “a peculiar temperament” or “personal characteristic.” In English, it has been used since the early 17th century to describe a characteristic, habit, or mannerism that is peculiar to an individual. Idiosyncrasies can be found in many different contexts, from art and culture to language and behavior. Today, idiosyncrasy remains a commonly used word in English, and is often associated with the quirks and eccentricities of human nature.