In geometry, a point that is well-distant from the boundaries of a figure. For instance, for a circle, the center is defined as the point equidistant from all points on the circle's boundary. Similar definitions can be made for other shapes in various geometries, though for arbitrary complex shapes there may be several definitions considered appropriate in some circumstances.
Cities often are said to have a center; it is also called "downtown".
In abstract algebra, the center of a group is the subgroup consisting of those elements which commute with all other elements. Similar definitions of center apply to other algebraic structures, for example, center (algebra).
