
A locking differential, differential lock, diff lock or locker is a variation on the standard automotive differential. A locking differential may provide increased traction compared to a standard, or `open` differential by restricting each of the two wheels on an axle to the same rotational speed without regard to available traction or differenc.....
Found on
http://en.wikipedia.org/wiki/Locking_differential

A differential whose two outputs can be locked together, eliminating any differential action but maximizing traction under slippery conditions.
Found on
http://www.caranddriver.com/reviews/glossary-of-terms-info
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