Which of the following is NOT one of the three size dimensions?

The three size dimensions typically refer to spatial measurements that describe the physical extent of an object in three-dimensional space. These dimensions are width, depth, and height, which define the overall shape and volume of an object.

Weight, on the other hand, is a measure of mass and the gravitational force acting on that mass, rather than a spatial dimension. It does not provide information about the object's physical size or shape in space. Therefore, weight does not fit within the definition of the three size dimensions and is the correct choice in this context.