The true definition of this word is a sensation of rotation, or movement of one’s self or of one’s surroundings, in any plane.  It makes the patient feel as though they are spinning, or the world around them is spinning when indeed it is not. It can be a slight sensation and last a short time, or it can be much more severe and continue for hours, or longer. Rocking vertigo is a sensation of movement such as on a boat – there may be a sensation of periodic rotation, or a sensation of swaying.