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

Established as a premier post-production showcase for international arthouse cinema, the initiative offers producers a strategic platform to present their projects to leading sales agents, distributors and festival programmers at a decisive stage in their films’ financing and market trajectory. —Anna Marie De La Fuente, Variety, 15 Feb. 2026

Over the next 10 years, the Goo Goo Dolls would follow a trajectory of seemingly insurmountable obstacles and increasingly unlikely triumphs that more closely resembles a fictional underdog team from a Disney movie than a rock band. —Sam Sodomsky, Pitchfork, 14 Feb. 2026

Shareholders should continue to accumulate shares as Teva is on a rapidly ascending earnings trajectory with a robust pipeline, the analyst said. —Michael Bloom, CNBC, 14 Feb. 2026

Even if software finds a way to recover its multiple and continue its upward trajectory, analysts are increasingly seeing a future of growing GDP and productivity without nearly as much human labor involved. —Nick Lichtenberg, Fortune, 13 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