aizan is right; any and all blur due to out of focus is "bokeh". Bokeh has lots of different looks depending on the oof objects themselves, the distance to these objects, the light, the lens and its aperture, and probably other factors. Some lenses produce disks of OOF point light sources or reflections that are brighter around the outside than in the middle, and depending on the nature of the OOF background may produce bokeh that is characterized as "unsettled." If the disks are brighter in the center, it tends to have a smoother look. But the OOF blur is all bokeh, disks or no... 🙂
Edit: I had read Rockwell's comments on bokeh before, and looking it over again now. he does offer a very simple explanation of the spherical aberration effects, but the very simplicity of his explanation is, well, over-simplified. In my view, you can't draw the lines so sharply and say that one kind of spherical aberration produces bad bokeh and the opposite aberration gives good bokeh. There are factors other than spherical aberration at work, and bokeh isn't just good/neutral/bad, but is just different in various ways.