In game development, a rigidbody is usually referred to anything that is affected by physics.

In game development, a rigidbody is usually referred to anything that is affected by physics. Although it also does suit the usual definition in physics itself.

From Wikipedia:

In physics, a rigid body is a solid body in which deformation is zero or so small it can be neglected. The distance between any two given points on a rigid body remains constant in time regardless of external forces exerted on it. A rigid body is usually considered as a continuous distribution of mass.

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