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A trajectory is the path that an object with mass in motion follows through space as a function of time. In physics, a trajectory is defined by the position of the object over time, which is described by the functions of position with respect to time. The trajectory of an object can be described mathematically either by the geometry of the path, or as a function of time, or both. Trajectory is often used interchangeably with orbit, but in common usage, orbit tends to refer to a path that is curved as under the influence of gravitation, whereas a trajectory is a path under any sort of influence. Trajectory is also used for the path of a projectile.

In Hebrew, trajectory is called מסלול תנועה (maslul t'nuah). In French, it is trajectoire, in Spanish trayectoria, in German Flugbahn, and in Russian траектория (traektoriy).

Key contextual information includes the fact that trajectories can be influenced by various forces, such as gravity, friction, and propulsion. The study of trajectories is crucial in fields like astrophysics, engineering, and ballistics. In astrophysics, understanding the trajectory of celestial bodies helps in predicting their movements and interactions. In engineering, analyzing trajectories is essential for designing efficient and safe systems, such as satellites and aircraft. In ballistics, the trajectory of a projectile is critical for determining its range and impact.