By the term polarization in case of light waves, we dont have any relation with the polarization in electro-statics. Here we mean that we are restricting the variations in the electric field in a particular way.
Eg. when we polarize a wave linearly, we restrict the variationso felectric field in a particular direction only transverse to the direction of propagation of wave.
There are many types of polarization like linear, circular, elliptical and i all these we basically restrict the variations of electric field in accordance to a particular formula with respect to space.