velocity

velocity — noun

1. a measurement of how fast an object or person moves, usually from one point to a

1.nounB2
Definition

a measurement of how fast an object or person moves, usually from one point to another through air, water, or space

Example

The wind velocity reached 130 kilometres per hour during the storm.

collocation: wind velocity

Sahil measured the velocity of the river current before the kayak race began.

velocity + of + [object] for measuring how fast

Common collocations
  • wind velocity
  • high velocity
  • average velocity
  • initial velocity
  • at full velocity
  • gain velocity
Synonyms
  • speed

    Everyday word for how fast something moves; less formal than velocity

  • pace

    Used especially for steady, repeated movement like walking or running

  • rate

    Focuses on how fast something happens or changes over time

Antonyms
  • slowness

    The quality of moving at low speed

Grammar Patterns

velocity + of + [something]

at + [adjective] + velocity

Usage Note

More formal than 'speed'. Common in weather reports, engineering, and news. In casual conversation, 'speed' is preferred.

Common Mistakes

The car's velocity was very fast.
The car was moving at high velocity.
'fast' describes the object, not the velocity measurement itself.
The wind blew at a high speed velocity.
The wind blew at high velocity.
'velocity' already means speed; using both is redundant.

2. a measurement that combines how fast an object moves with the specific direction

2.nounB2
Definition

a measurement that combines how fast an object moves with the specific direction it follows, used especially in physics and engineering

Example

Talia calculated the velocity of the car moving north at sixty kilometres per hour.

velocity includes direction — vector quantity

When Hari turned the car left at the traffic lights, its velocity changed even though the speed stayed the same.

concrete: direction change at an intersection

Common collocations
  • constant velocity
  • terminal velocity
  • escape velocity
  • relative velocity
  • orbital velocity
  • change velocity
Synonyms
  • speed

    Only measures how fast; does not include direction

  • momentum

    Combines velocity with mass; a physics quantity that measures motion in a direction

Grammar Patterns

velocity + of + [object] + [direction]

at + [number] + [direction] + velocity

Usage Note

In physics, velocity is a vector quantity that requires direction. If no direction is given, use 'speed' instead. Distinguish from sense 1 (GENERAL SPEED), which measures only how fast.

Common Mistakes

The velocity of the plane is 900 km/h.' (in a physics task, with no direction given)
The velocity of the plane is 900 km/h heading west.
In physics, velocity must include direction; otherwise use 'speed'.
Speed and velocity are the same thing.
Speed tells you how fast something moves; velocity also tells you which way it is going.
They are different concepts in physics.

Word family

  • velocities
    plural nounB2

Synonym discussion

Sense: noun/1

All four words relate to how fast something moves or happens, but they differ in scope and formality. 'Speed' is the broadest everyday word for how fast something travels (e.g., 'The car picked up speed on the highway'). 'Pace' focuses on a steady, repeated rate, especially in walking, running, or work ('She set a comfortable pace for the hike'). 'Rate' measures how fast something changes or occurs over time, often in percentages or frequencies ('The interest rate rose sharply'). 'Velocity' is the most formal and technical of the group, used in scientific or engineering contexts to describe precise measurements of motion. In casual conversation, choose 'speed' or 'pace'; in technical writing, 'velocity' or 'rate' is more appropriate.

speed ↗pace ↗rate ↗velocity ↗

Common collocations

Nouns

Adverbs

Phrases

  • at full velocity
  • with great velocity
  • velocity of light

Prepositions

Etymology

LatinFrenchEnglish

From Latin 'vēlōcitās' meaning 'swiftness, speed', which comes from 'vēlōx' meaning 'swift, quick'. The word entered English in the 16th century through French and was used in physics from the 17th century to describe directional motion, distinguishing it from simple speed.