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[Gr. idiosyncrasia, individual mixture, individual temperament]
1. Special characteristics by which persons differ from each other.
2. That which makes one react differently from others; a peculiar or individual reaction to an idea, action, drug, food, or some other substance through unusual susceptibility.
idiosyncratic (id″ē-ō-sin-krat′ik ) (id″ē-ō-sing-krat′ik ), adj.