The Collaborative International Dictionary of English v.0.48:

Orbit \Or"bit\, n. [L. orbita a track or rut made by a wheel,
   course, circuit, fr. orbis a circle: cf. F. orbite. See 2d
   Orb.]
   1. (Astron.) The path described by a heavenly body in its
      periodical revolution around another body; as, the orbit
      of Jupiter, of the earth, of the moon.
      [1913 Webster]

   2. An orb or ball. [Rare & Improper]
      [1913 Webster]

            Roll the lucid orbit of an eye.       --Young.
      [1913 Webster]

   3. (Anat.) The cavity or socket of the skull in which the eye
      and its appendages are situated.
      [1913 Webster]

   4. (Zool.) The skin which surrounds the eye of a bird.
      [1913 Webster]

WordNet (r) 3.0 (2006):

orbit
    n 1: the (usually elliptical) path described by one celestial
         body in its revolution about another; "he plotted the orbit
         of the moon" [syn: orbit, celestial orbit]
    2: a particular environment or walk of life; "his social sphere
       is limited"; "it was a closed area of employment"; "he's out
       of my orbit" [syn: sphere, domain, area, orbit,
       field, arena]
    3: an area in which something acts or operates or has power or
       control: "the range of a supersonic jet"; "a piano has a
       greater range than the human voice"; "the ambit of municipal
       legislation"; "within the compass of this article"; "within
       the scope of an investigation"; "outside the reach of the
       law"; "in the political orbit of a world power" [syn:
       scope, range, reach, orbit, compass, ambit]
    4: the path of an electron around the nucleus of an atom [syn:
       orbit, electron orbit]
    5: the bony cavity in the skull containing the eyeball [syn:
       eye socket, orbit, cranial orbit, orbital cavity]
    v 1: move in an orbit; "The moon orbits around the Earth"; "The
         planets are orbiting the sun"; "electrons orbit the
         nucleus" [syn: orb, orbit, revolve]

Moby Thesaurus II by Grady Ward, 1.0:

242 Moby Thesaurus words for "orbit":
   Earth insertion, LEM, LM, O, air lane, ambit, annular muscle,
   annulus, aphelion, apogee, area, arena, areola,
   astronomical longitude, attitude-control rocket, aureole,
   autumnal equinox, bailiwick, ball, ballistic capsule, balloon,
   beat, bladder, blob, boll, bolus, border, borderland, bubble, bulb,
   bulbil, bulblet, burn, capsule, celestial equator,
   celestial longitude, celestial meridian, chaplet, circle, circling,
   circuit, circuiteer, circuition, circuitousness, circuitry,
   circularity, circulate, circulation, circumambience,
   circumambiency, circumambulate, circumambulation, circumference,
   circumflexion, circumlocution, circummigrate, circummigration,
   circumnavigate, circumnavigation, circumvent, circus,
   close the circle, closed circle, colures, come full circle,
   compass, constituency, corona, coronet, course, crown, cycle,
   deep-space ship, demesne, department, describe a circle, deviance,
   deviancy, deviation, deviousness, diadem, digression, discipline,
   discus, disk, docking, docking maneuver, domain, dominion,
   ecliptic, ellipsoid, encircle, encompass, equator, equinoctial,
   equinoctial circle, equinoctial colure, equinox, eternal return,
   excursion, excursus, extension, extent, fairy ring, ferry rocket,
   field, flank, flight path, footing, fuel ship, full circle,
   galactic longitude, garland, geocentric longitude,
   geodetic longitude, geoid, girdle, girdle the globe, globe,
   globelet, globoid, globule, glomerulus, glory, go about, go around,
   go round, go the round, gob, gobbet, great circle, gyre, gyring,
   halo, heliocentric longitude, hemisphere, indirection, injection,
   insertion, itinerary, judicial circuit, jurisdiction, knob, knot,
   lap, lasso, line, logical circle, longitude, loop, looplet,
   lunar excursion module, lunar module, magic circle, make a circuit,
   manned rocket, march, meandering, meridian, module, moon ship,
   multistage rocket, noose, oblate spheroid, orb, orbiting, orblet,
   pale, parking orbit, path, pellet, perigee, perihelion, period,
   precinct, primrose path, prolate spheroid, province, purview,
   radius, reach, realm, reentry, revolution, revolve, ring, road,
   rocket, rondelle, rondure, round, round trip, roundaboutness,
   roundel, rounding, rounds, route, run, saucer, scope, sea lane,
   shortcut, shuttle rocket, skirt, small circle, soft landing,
   solstitial colure, space capsule, space docking, space rocket,
   spacecraft, spaceship, sphere, sphere of influence, spheroid,
   spherule, sphincter, spiral, spiraling, stamping ground,
   subdiscipline, surround, sweep, territory, tour, track,
   trade route, traject, trajectory, trajet, turf, turn, turning,
   vantage, vernal equinox, vicious circle, walk, wheel, wheeling,
   wreath, zodiac, zone



The Free On-line Dictionary of Computing (30 December 2018):

Orbit

   A Scheme compiler.

   ["Orbit: An Optimising Compiler for Scheme", D.A. Kranz et al,
   SIGPLAN Notices 21(7):281-292 (Jul 1986)].

   (1994-10-28)