Elliptically polarized wave
A wave which can be resolved into two plane polarized waves which are perpendicular to each other and propagate in the same direction. The amplitudes of the waves may be equal or un-equal and of arbitrary time-phase. The tip of the component of the electric field vector in the plane normal to the direction of propagation describes an ellipse.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM