The representation of something; delineation; plan;
   especially, the representation of any object on a perspective plane, or
   such a delineation as would result were the chief points of the object
   thrown forward upon the plane, each in the direction of a line drawn
   through it from a given point of sight, or central point; as, the
   projection of a sphere. The several kinds of projection differ
   according to the assumed point of sight and plane of projection in
   each.