the location in a rectangle that is midway between each pair of sides, or, equivalently, which lies at the intersection of the two diagonals that could be drawn form opposite corners
a location within an irregular area which satisfies some metric analogous to one of the above
a location within a solid (three-dimensional object) which is analogous to one of the above
a place where some function or activity occurs (shopping center, convention center)
a topic that is particularly important in a given context (the center of the controversy)
(basketball) The player, generally the tallest, who plays closest to the basket.
