The maximum distance or angle through which any part of a mechanical system may be moved in one direction without applying appreciable force or motion to the next part in mechanical sequence
Assuming Backlash of 10 with a Rate of 1. It will move to the middle. Set the backlash amount to 0. If you are at the edge of Backlash say 5 and reverse direction, the next sample it will change Backlash compensation to 4, then 3, all the way to -5.