differential

Once we've stopped the danger element of the tide and got a differential, we've effectively created a reservoir upstream of the Barrier.

However, all these individual, unconnected points of contact with the earth leave quite a bit of room for differential movement.

Some have theorized that the pattern helps zebras stay cool in direct sunlight, with the heat differential between their black and white stripes generating cooling air currents.

Mainly, they are large enough that one part could move relative to the other parts, a phenomenon we call differential movement.