Eccentricity - Definition
eccentricity
n 1: strange and unconventional behavior
2: (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"
3: a circularity that has a different center or deviates from a
circular path [ant: concentricity]