The bony cavity in the lateral front of the skull beneath the frontal bone which contains the eyeball. Also known as eye socket.

Let G be a group which operates on a set S; the orbit of an element s of S under G is the subset of S consisting of all elements gs where g is in G.

The path of a water particle affected by wave motion; it is almost circular in deep-water waves and almost elliptical in shallow-water waves.

1. Any closed path followed by a particle or body, such as the orbit of a celestial body under the influence of gravity, the elliptical path followed by electrons in the Bohr theory, or the paths followed by particles in a circular particle accelerator.

2. More generally, any path followed by a particle, such as helical paths of particles in a magnetic field, or the parabolic path of a comet.