centroid

noun
cen·troid | \ ˈsen-ˌtrȯid \

Definition of centroid 

2 : a point whose coordinates (see coordinate entry 3 sense 1) are the averages of the corresponding coordinates of a given set of points and which for a given plane or three-dimensional figure (such as a triangle or sphere) corresponds to the center of mass of a thin plate of uniform thickness and consistency or a body of uniform consistency having the same boundary

First Known Use of centroid

1844, in the meaning defined at sense 1

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The first known use of centroid was in 1844

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