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

Many workers might not experience a rollercoaster trajectory as dramatic as Nvidia’s path from PC graphics provider to AI titan, but every period brings its changes and challenges. — Tamlin Magee, Fortune, 8 Oct. 2026

Based on the New York Times best-selling novels by Nevada Barr, the first season follows Anna Pigeon (Tracy Spiridakos), a former city slicker who became a park ranger after a devastating loss changed the trajectory of her life forever. — Katie Campione, Deadline, 7 Oct. 2026

Madison has made a smart choice for her biggest role since bagging an Oscar for Anora; her character’s trajectory from Facebook believer through disillusioned outlier to courageous whistleblower is stirringly rendered. — David Rooney, HollywoodReporter, 7 Oct. 2026

For the prominent artists featured, did the Bicentennial projects change the trajectory of their work or reception? — Anna Kornbluh, ARTnews.com, 7 Oct. 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