What does trajectory mean?
A trajectory is the path followed by a moving object, particularly one traveling through space or falling under the influence of gravity. A projectile’s trajectory can be calculated from its initial direction and speed, while a spacecraft may follow a carefully planned orbit. The word also has a broad figurative meaning: the course or development of a person, organization, event, or process. For example, a company may be described as being on an upward trajectory because its performance is improving steadily, while a person’s career trajectory refers to the general direction and progression of their working life. In these uses, “trajectory” suggests an established or predictable direction, not merely a temporary change. It is common in scientific, business, political, and journalistic writing, and it combines technical precision with a sense of development over time. The term is also useful when describing patterns that unfold gradually, such as economic growth, technological progress, or the changing course of a project.
nounThe path followed by a moving object, especially under the influence of gravity or another force. By extension, it means the course or development of a person, organization, event, or process over time.
- The path traced by a moving object, especially one traveling through space or falling under the influence of gravity.
- The course, direction, or development of a person, organization, event, or process.
"The satellite followed a carefully calculated trajectory around the Earth."
"The rocket adjusted its trajectory to avoid the storm clouds."
"Her rapid promotion changed the trajectory of her career."
The standard plural adds -ies to the form ending in -y.
"The two rockets followed different trajectories."
From a Latin word meaning “to throw across,” trajectory originally described the path made by something thrown, such as an arrow.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of trajectory
The word entered English in the 17th century from Latin, where traiectus was a past participle meaning “thrown across.” It was formed from a form of traicere, “to throw across,” combining trans- and jacere, “to throw.” English derivatives such as project and reject ultimately share the same Latin root, although their immediate formations and modern meanings differ.
Related word forms
How trajectory is actually used
The word is formal but widely understood in scientific, journalistic, and business contexts. In physics, it refers to a path that may be curved or nearly straight. Figurative uses often describe development over time, as in “career trajectory.”