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de:Bahn means "orbit" - not just in astronomy, but also in ballistics, science, and even in rather specialised mathematics. Indeed, I would think this is the primary meaning, and the most one-to-one translation: the volume or area potentially used by a moving object, even if currently blocked. In particular, note the expression "sich Bahn brechen" or "Bahn brechen": to clear away obstacles in one's way.