trajectory

noun

tra·​jec·​to·​ry trə-ˈjek-t(ə-)rē 

plural trajectories

1

: the curve that a body (such as a planet or comet in its orbit or a rocket) describes in space

the trajectory of a missile

2

: a path, progression, or line of development resembling a physical trajectory

an upward career trajectory

the nation's economic trajectory

Did you know?

Formed with part of the prefix trans-, "across", trajectory means a "hurling across". By calculating the effect of gravity and other forces, the trajectory of an object launched into space at a known speed can be computed precisely. Missiles stand a chance of hitting their target only if their trajectory has been plotted accurately. The word is used most often in physics and engineering, but not always; we can also say, for example, that the trajectory of a whole life may be set in a person's youth, or that a new book traces the long trajectory of the French empire.

Examples of trajectory in a Sentence

the trajectory of the missile

Recent Examples on the Web

Markets are keen to reduce their exposure, given geopolitical uncertainty and huge spending by tech giants, but do not want to miss out on future gains should the upward US trajectory continue. —semafor.com, 23 Feb. 2026

Nothing was said or done in the roughly 35 minutes the candidates devoted to themselves that seemed likely to change the dynamic or trajectory of a race that remains stubbornly ill-defined and, to an unprecedented degree in modern times, wide open. —Los Angeles Times, 22 Feb. 2026

Aligning athlete eligibility with the ordinary trajectory of a college student struck Traum as problematic for additional reasons, too. —Michael McCann, Sportico.com, 22 Feb. 2026

This was a southerly trajectory launch. —Richard Tribou, The Orlando Sentinel, 22 Feb. 2026

Word History

Etymology

New Latin trajectoria, from feminine of trajectorius of passing, from Latin traicere to cause to cross, cross, from trans-, tra- trans- + jacere to throw — more at jet

First Known Use

1696, in the meaning defined at sense 1

Rhymes for trajectory

• directory
• refectory
• nectary
• rectory
• subdirectory

Kids Definition

trajectory

noun

tra·​jec·​to·​ry trə-ˈjek-t(ə-)rē 

plural trajectories

: the curve that a body (as a planet in its orbit or a rocket) travels along in space