Definition of "excentricity" [ex•cen•tric•i•ty]

• Archaic form of eccentricity. (noun)

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• "Hitherto, since Ptolemy had given no reason for this assumption, Kepler had preferred not to make it, only taking for granted that the centre was at some point on the line called the excentricity (see Figs. 1, 2)."
• "Without this actual measurement we might have thought that the excentricity was the effect of the projection of the circles on the apparent concavity of the sky."
• ""excentricity" because the foci (not the centre) of an ellipse are regarded as the representatives of the centre of a circle."