The Collaborative International Dictionary of English v.0.48:

Trajectory \Tra*ject"o*ry\, n.; pl. Trajectories. [Cf. F.
   trajectoire.]
   The curve which a body describes in space, as a planet or
   comet in its orbit, or stone thrown upward obliquely in the
   air.
   [1913 Webster] Trajetour
   Trajet

WordNet (r) 3.0 (2006):

trajectory
    n 1: the path followed by an object moving through space [syn:
         trajectory, flight]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "trajectory":
   air lane, altitude peak, aphelion, apogee, astronomical longitude,
   automatic control, autumnal equinox, beat, blast-off, burn,
   burnout, ceiling, celestial equator, celestial longitude,
   celestial meridian, circle, circuit, colures, course, descent,
   ecliptic, end of burning, equator, equinoctial, equinoctial circle,
   equinoctial colure, equinox, flight, flight path,
   galactic longitude, geocentric longitude, geodetic longitude,
   great circle, heliocentric longitude, ignition, impact, itinerary,
   launch, lift-off, line, longitude, meridian, orbit, path, perigee,
   perihelion, period, primrose path, road, rocket launching, round,
   route, run, sea lane, shoot, shortcut, shot, small circle,
   solstitial colure, tour, track, trade route, traject, trajet,
   velocity peak, vernal equinox, walk, zodiac, zone