First attested in 1604, in modern sense since 1665, from Old French idiosyncrasie, from Ancient Greek ἰδιοσυγκρασία (idiosunkrasía, “one’s own temperament”), from ἴδιος (ídios, “one’s own”) + σύν (sún, “together”) + κρᾶσις (krâsis, “temperament”).
idiosyncrasy (plural idiosyncrasies)
- A behavior or way of thinking that is characteristic of a person.
- A language or behaviour that is particular to an individual or group.
- (medicine) A peculiar individual reaction to a generally innocuous substance or factor.
- A peculiarity that serves to distinguish or identify.
- He mastered the idiosyncrasies of English spelling.
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