I hope the people here will not be annoyed from my writting in old topics.
For me stretching is what both K and D said. But I don't separate mobility and limbering. If it isn't a new ROM I just start with some light movement (limbering) and after that (if I want) explore a bit more strengthening exercises in this ROM (which for me means mobility). But if I'm not sore I could start right away with the tougher exercises. Just doesn't see any benefit to add one more term here- stretching and limbering, I think are quite enough.