Definition of trajectory in English:


Syllabification: tra·jec·to·ry
Pronunciation: /trəˈjekt(ə)rē

noun (plural trajectories)

1The path followed by a projectile flying or an object moving under the action of given forces: the missile’s trajectory was preset figurative the rapid upward trajectory of Rich’s career
More example sentences
  • As supply meets demand, a future is created, independent of any plan, but revealed in the trajectories of market forces.
  • Mortars are ballistic weapons that have projectile trajectories undistorted by rocket engine or guidance system.
  • Suborbital paths are the trajectories of choice for ballistic missiles.
2 Geometry A curve or surface cutting a family of curves or surfaces at a constant angle.
More example sentences
  • These three trajectories are known as conic sections, as they are also the curves produced by cutting a cone along different planes.
  • The thick line is a calculated trajectory near a surface and the thin line is a trajectory far from any surface.
  • To investigate this possibility, a simple system can be designed to generate drip trajectories where the degree of chaos can be tuned.


late 17th century: from modern Latin trajectoria (feminine), from Latin traject- 'thrown across', from the verb traicere, from trans- 'across' + jacere 'to throw'.

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