Trajectory

Return to > Dictionary

1. Definition + Rich Everyday Explanation

Trajectory (noun) ( trə dʒɛk tə ri ) = the curved path of an object moving through space; the course or direction of something developing over time.

Imagine throwing a basketball — it arcs beautifully before swishing the net. That’s the literal trajectory, the flight path shaped by gravity. But people use it way more for life’s direction: a career trajectory climbing upwards, or a company’s trajectory heading for success. It’s about the route something takes — predictable in physics, hopeful or worrying in human stories.

MEANING 1: Path of a Moving Object (Physics) — VERY COMMON

Literally, trajectory is the curved route a projectile follows under forces like gravity. Rockets have launch trajectories. Bullets or footballs trace trajectories in air. This scientific sense is precise — calculated for accuracy in sports, space, or ballistics. It evokes motion with a clear beginning, arc, and end.

MEANING 2: Course or Direction Over Time (Figurative) — VERY COMMON

Metaphorically, trajectory describes the path or trend of development. An upward career trajectory means steady progress. A downward trajectory signals decline. Politicians talk about economic trajectories. This usage borrows physics’ inevitability — once set, paths are hard to change without force.

Examples from the street:

• “The ball’s trajectory was perfect” → the throw arced exactly right for the goal
• “Her career trajectory is impressive” → professional path shows consistent upward progress
• “On its current trajectory, we’ll succeed” → following present direction, positive outcome likely

2. Most Common Patterns

Trajectory as physical path:

• trajectory of + object → path followed by something moving
• calculate/follow trajectory → determine or trace the route

Trajectory as development course — VERY COMMON:

• trajectory of + noun (career/life/company) → direction over time
• upward/downward trajectory → improving or declining path
• on a/current trajectory → following present course
• change/alter trajectory → shift direction

3. Phrasal Verbs

Note: “Trajectory” doesn’t form common phrasal verbs — these are related expressions:

• change course → alter direction, similar to shifting trajectory
  Example: “The company changed course to focus on new markets.”
• head towards → move in a direction
  Example: “Her efforts are heading towards success.”
• set on a path → establish a trajectory
  Example: “Early habits set children on a positive path.”

4. Example Sentences

1. The rocket’s trajectory took it into orbit
   → The spacecraft’s curved path carried it around Earth.
2. His career trajectory shows steady rise
   → Professional development indicates consistent advancement.
3. Sales are on an upward trajectory
   → Revenue figures demonstrate increasing trend.
4. We need to change trajectory now
   → The direction requires alteration immediately.
5. The ball followed a high trajectory
   → The sphere arced steeply through air.
6. Her life trajectory changed after university
   → Personal path shifted significantly post-education.
7. On its current trajectory, success seems likely
   → Following present course, positive results appear probable.
8. The trajectory of the economy worries experts
   → Financial direction concerns specialists.
9. A downward trajectory in performance
   → Declining trend in results observed.
10. Scientists calculated the asteroid’s trajectory
    → Researchers determined the space rock’s path precisely.

5. Personal Examples

1. A student’s fluency trajectory improves with consistent practice — small daily efforts create upward progress
   → Learner’s smooth expression path advances through regular exercises — minor ongoing work builds steady improvement.
2. When motivation dips, remembering your learning trajectory helps — past gains show current efforts matter
   → During low drive periods, recalling acquisition direction assists — previous achievements demonstrate present input counts.

6. Register: Neutral

✔ Native usage tips

• Metaphorical boom: “Trajectory” popular for careers/lives — implies momentum and direction
• Positive/negative: “Upward trajectory” hopeful; “downward” concerning
• Business/science: Common in forecasts — “projected trajectory”
• “On a trajectory”: Means heading toward outcome — inevitable feel
• Physics origin: Literal for paths; figurative borrows inevitability

✔ Similar expressions / words

• Path → similar direction; trajectory adds curve/momentum
• Course → route over time; less scientific
• Trend → pattern of change; trajectory implies projected future