Multiaxial movement of bone (about three axes), on essentially flat articular surfaces; simple movement within narrow limits, as between articular processes of vertebrae.

movement in one plane, as in sliding.

A term describing the skier's movement on straight, flat sections of a downhill course.

the activity of flying a glider

Gliding (also known as soaring) is a recreational activity and competitive sport in which pilots fly un-powered aircraft known as gliders or sailplanes. Properly, the term gliding refers to descending flight of a heavier-than-air craft, whereas soaring is the correct term to use when the craft gains altitude or speed from rising air.