n. (pl. -ies)
1. a mental constitution, view or feeling, or mode of behaviour, peculiar to a person.
2 anything highly individualized or eccentric.
3 a mode of expression peculiar to an author.
4 Med. a physical constitution peculiar to a person.
Derivatives:
idiosyncratic adj. idiosyncratically adv.
Etymology: Gk idiosugkrasia f. idios own + sun together + krasis mixture