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