Mechanical device and Ski binding

Mechanical device noun - Mechanism consisting of a device that works on mechanical principles.

Ski binding and mechanical device are semantically related. In some cases you can replace phrase "Ski binding" with "Mechanical device", this phrases are similar.

Ski binding noun - One of a pair of mechanical devices that are attached to a ski and that will grip a ski boot; the bindings should release in case of a fall.

Mechanical device and ski binding are semantically related. You can use "Mechanical device" instead a noun phrase "Ski binding".