n. Track; course; path, especially a path, as that in a circle or an ellipse, which returns into itself; specifically, in astronomy, the path of a planet or comet; the curve-line which a planet describes in its periodical revolution round its central body or center of revolution: as, the orbit of Jupiter or Mercury.n. A small orb, globe, or ball.n. In anatomy and zoology, the bony cavity of the skull which contains the eye; the eye-socket.n. In ornithology, the orbita, or circumorbital region of a bird's head; the skin of the eyelids and adjoining parts.n. In entomology, the border surrounding the compound eye of an insect, especially when it forms a raised ring, or differs in color or texture from the rest of the head.