Etymology
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eccentricity (n.)

1540s, of planetary orbits; 1650s, of persons (an instance of eccentricity); 1794, of persons (a quality of eccentricity); from eccentric (adj.) + -ity or from Modern Latin eccentricitatem, from eccentricus. Related: Eccentricities.

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Definitions of eccentricity

eccentricity (n.)
strange and unconventional behavior;
eccentricity (n.)
(geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis;
a circle is an ellipse with zero eccentricity
eccentricity (n.)
a circularity that has a different center or deviates from a circular path;
From wordnet.princeton.edu