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

Alber walked jurors through Pino’s trajectory on the day of the crash in a series of maps created from GPS data. —Grethel Aguila, Miami Herald, 16 June 2026

His career has been on a sharp upward trajectory. —Stewart Clarke, Deadline, 16 June 2026

That juxtaposition with his trajectory and how things unfolded felt very unique in that way. —Ryan Lattanzio, IndieWire, 16 June 2026

Crow-Armstrong, who was a single short of the cycle Saturday in San Francisco, hit a leadoff home run in the first inning, tripled off the wall on almost the same trajectory in the third and doubled down the right-field line in the fifth. —ABC News, 16 June 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