trajectory

[truh-jek-tuh-ree]

noun

plural

trajectories 

1. the curve described by a projectile, rocket, or the like in its flight.

2. Geometry.,  a curve or surface that cuts all the curves or surfaces of a given system at a constant angle.

trajectory

/ -trɪ, trəˈdʒɛktaɪl, trəˈdʒɛktərɪ /

noun

1. the path described by an object moving in air or space under the influence of such forces as thrust, wind resistance, and gravity, esp the curved path of a projectile

2. geometry a curve that cuts a family of curves or surfaces at a constant angle

trajectory

1. Physics,  The line or curve described by an object moving through space.

2. Mathematics,  A curve or surface that passes through a given set of points or intersects a given series of curves or surfaces at a constant angle.

Other Word Forms

• trajectile adjective
• trajection noun

Word History and Origins

Origin of trajectory¹

First recorded in 1660–70; from New Latin trājectōria, noun use of feminine of Medieval Latin trājectōrius “casting over”; equivalent to traject + -tory ¹

Example Sentences

It was, for a time, a rollicking trajectory.

Read more on Los Angeles Times

"But obviously this is incredible that Polly managed to save a life and change the trajectory of that life forever."

Read more on BBC

"Since then, the China-US relationship has generally maintained a steady and positive trajectory, and this is welcomed by the two countries and the broader international community," the Chinese statement said.

Read more on BBC

These dynamics leave crucial decisions in the hands of a few advisory firms that wield disproportionate influence over the trajectory of corporations while operating with minimal accountability.

Read more on The Wall Street Journal

If the personnel changes and upward trajectory continue, it will complete a hugely promising 2025 and add more options and intrigue to Borthwick's hand.

Read more on BBC

Related Words

• curve 
• orbit 
• path 

When To Use

What does trajectory mean?

The trajectory of an object is the path it follows once in flight or in motion.The word is especially used in the context of the path of projectiles like rockets, but it can be used in many different contexts.The trajectory of a golf ball is the curved path it follows in the air after being hit by a golf club. The trajectory of an asteroid is the path it follows in space. The potential trajectory of a storm is the route that it may travel.In geometry, trajectory is used in a more specific way to refer to a curve that intersects through a series of points at the same angle.Example: Try to determine the trajectory of the ball as it flies through the air so you can position yourself to catch it.