Webster's English Dictionary

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eccentricity

ec.cen.tric.i.ty \.ek-.sen-'tris-*t-e-\ n 1a: the quality or state of being 
   eccentric  1b: deviation from an established pattern, rule, or norm; esp : 
   odd  or whimsical behavior 2: the ratio of the distances from any point of 
   a conic section to a focus  and the corresponding directrixor habit. 
   ECCENTRICITY stresses divergence from the usual or customary and suggests 
   at least mild mental aberration; IDIOSYNCRASY stresses the following of 
   one's particular bent or temperament and connotes strong individuality and 
   independence of action SYN syn ECCENTRICITY, IDIOSYNCRASY mean a strange 
   trait, trick,