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Center

The point that is the same distance from all the points on a circle.   The point that is the same distance from all the points on a sphere.   The point inside an ellipse where the major and the minor axes intersect.   The center of a circle that can be inscribed in a regular polygon.

Etymology

The Latin word centrum was the center, or the stationary point of a compass evolved from Greek kentron, a sharp point including the sharp fixed point of a compass, deriving from the Indo-European root kent- meaning 'to prick with a point.'

Related mathematical terms

Eccentricity, Concentric

Other related words

Eccentric (out of the center), concentrate, central, centrifuge ('running away', cf, 'fugitive', from the center).