°(mathematics physics) The
point at the
centre of any shape, sometimes called centre of area or centre of volume. For a triangle, the centroid is the point at which the
medians intersect. The
co-ordinates of the centroid are the
average (
arithmetic mean) of the co-ordinates of all the points of the shape. For a shape of uniform density, the centroid coincides with the
centre of mass which is also the
centre of gravity in a uniform gravitational field.