【Eccentricity】 , 【idiosyncrasy】 are not always clearly distinguished when they denote an act, a practice, or a characteristic that impresses the observer as strange or singular.

【Eccentricity】 (compare STRANGE) emphasizes the idea of divergence from the usual or customary; 【idiosyncrasy】  implies a following of one's peculiar temperament or bent especially in trait, trick, or habit; the former often suggests mental aberration, the latter, strong individuality and independence of action.

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