center of gravity
/ˌsɛn.təɹ əv ˈɡɹæv.ə.ti/noun
Graduate
1
A point, near or within a body, through which its weight can be assumed to act when considering forces on the body and its motion under gravity. This coincides with the center of mass in a uniform gravitational field.
2
The most central or important part of something, or around which everything else revolves.