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Related to centroid: moment of inertia
1. See center of mass.
2. The point in a system of masses each of whose coordinates is a weighted mean of coordinates of the same dimension of points within the system, the weights being determined by the density function of the system.
a. the centre of mass of an object of uniform density, esp of a geometric figure
b. (of a finite set) the point whose coordinates are the mean values of the coordinates of the points of the set
2. the point where the medians of a triangle intersect.