Rotation as a vector
Definition of terms is definitely important - which makes your statement correct, b1ueshift. Displacements *ARE* vectors, distances, as I said in my previous post, are not.
As an example, the distances from Charleston, SC to Seattle, WA and from New York, NY to San Diego, CA are approximately the same. The displacement vectors between them are different, because the direction is different, even though the distance is the same.