Quoted By:
>Rogue Trader Book pg 308
>Fuedal Worlds
>The word 'fuedal' refers not to a political system, for the entire Imperium is administered according to a feudal system, but instead to the world's technical base, which will just be prior or just post black-powder. This may be the case because the planet has been cut off by warp storms for many centuries and regressed in the meantime, or its society might be rebuilding following a long period of war or some other form of planet-wide disaster. In general, the Imperium will allow such worlds to progress at their own pace, and it may be centuries until a Fuedal World progresses to a level similar to the bulk of the Imperium
So at least in this bit the entire Imperium sorta kinda already operates under fuedalistic structure (high born, low born, nobility, etc.) but Fuedal Worlds are specifically backwater planets.
