velocityve‧lo‧ci‧ty /vəˈlɒsəti $ -ˈlɑː-/ ●○○ noun (plural velocities) 
the velocity of light The speedboat reached a velocity of 120 mph. a high velocity bullet2[uncountable] a high speed: Martinez had good velocity on his fastball.
WORD ORIGINvelocity
Origin:
1500-1600 French vélocité, from Latin velocitas, from velox ‘fast’EXAMPLES FROM OTHER DICTIONARIES
- a beam of high velocity electrons
- an experiment to try to predict the velocity of a moving object
- the velocity of electrons
- This instrument is used for measuring wind velocity.
- Figure 21.4 shows oscillograms of the velocity fluctuations at different distances from the centre line of a wake.
- In addition, there is no difference in velocity between movements which are long and those which are short.
- Jupiter is a very massive planet, and its escape velocity is correspondingly high.
- Momentum is mass times velocity, so both factors influence the size of centripetal force.
- The pressure of the expanding gas gets converted to velocity.
- This latter emission is a well-known indicator of shock activity for shock velocities of up to several hundred kilometres a second.
Longman Language Activatornot able to speak
· The train's designers claim it is capable of attaining speeds in excess of 350 kph.· sensors which monitor speed and body movementspeed of · What was the speed of the car at the time of the accident?· the internal processing speed of a computerat a speed of 50 mph/10 metres per second etc · The Earth moves round the Sun at a speed of 30 km per second.at a constant/steady speed (=keeping the same speed all the time) · Keep driving at a constant speed until I tell you differently.top speed (=the fastest speed that a car, plane etc can reach) · The Ferrari Testarossa has a top speed of 188 mph.
how fast things happen, change, or develop: at a faster/slower/different etc rate: · Individual children develop physically and emotionally at different rates.at an alarming rate (=very fast): · Our money was running out at an alarming rate.rate of: · The amount of light available will determine the plant's rate of growth.· equipment that can load ships at a rate of 5000 tonnes a day
how fast someone walks or runs, or how fast they work or do things: at a brisk/steady/gentle etc pace: · The soldiers were marching at a steady pace.at a leisurely pace (=at a slow comfortable speed): · We climbed at a leisurely pace, stopping occasionally to enjoy the view.pace of: · The pace of political change has been rapid.pace of work/life: · I'm enjoying the relaxed pace of life of Jamaica.at your own pace (=at a speed that is right for you): · The Kumon method involves students learning at their own pace.
the speed at which something moves in a particular direction - use this especially in technical contexts: · This instrument is used for measuring wind velocity.velocity of: · an experiment to try to predict the velocity of a moving objecthigh velocity: · a beam of high velocity electrons
the force that makes a moving object keep moving: · We are trying to measure the position and momentum of an electron as accurately as possible.gain/gather momentum (=move faster): · As the slope got steeper, the sled gathered momentum.lose momentum (=move slower): · The ball was moving along, slowly losing momentum on the bumpy ground.
use these expressions to say how fast something moves: · The maximum speed on British motorways is 70 miles per hour.· Sound travels through the air at about 340 metres per second.· a propeller that revolves at a rate of 150 revolutions per minute
COLLOCATIONS FROM THE ENTRY The speedboat reached a velocity of 120 mph. a high velocity bulletCOLLOCATIONS FROM THE CORPUSADJECTIVE
1[countable, uncountable] technical the speed of something that is moving in a particular direction: The speedboat reached a velocity of 120 mph. a high velocity bullet· When considering circular motion it is often easier to work in terms of the angular velocity rather than ordinary linear velocity.· The Lift's wide, so the angular velocity is higher on the outside.
· The 109 V8 has constant velocity joints within its hubs.· Our model requires two sites of learning so that constant head velocity can generate constant eye velocity.· According to an experiment carried out in 1897, light always travels at the same constant velocity.· The mass column density along a line-of-sight for a constant outflow at velocity v is therefore.· Reciprocal motion Reciprocal motion, positive and negative at constant mean velocity, is unnerving, mechanistic and inhuman.
· Notice that one frame in free fall can have a very different velocity and acceleration from another such frame.· How is it that observers moving with different uniform velocities can be equivalent with respect to Minkowskian geometry?
· The true velocities may be higher than the velocities measured in projection.· There were early experiments, some of them successful, in which objects moving at high velocity were arrested by the camera.· The smaller the proportion, the lower the demand and obviously the higher is velocity.· He was in no hurry, and it was dangerous to move at a high velocity so near the ship.· Very high velocities have been observed in the movement of spray rising from impacts of this type.· This could be a direct consequence of the high internal velocity dispersion in the molecular clouds.
· What ever the bone type, however, Dodson found that very low water velocities were sufficient to move small mammal bones.· Throughout the campaign troops have been issued with various flak jackets which give a degree of protection against low velocity rounds.
· A maximum velocity at the equator reduces to a theoretical nil at the poles.· The maximum possible impact velocity for a solar system body striking Earth is a little more complicated to calculate.· The motor velocity increases under the influence of the positive torque and the equilibrium position is attained with maximum velocity.· Accelerating violence and horror eventually hit maximum velocity and warp into nonsense, no matter how erudite the script.
· The mean velocity also varies vertically, and we shall confine attention to two-dimensional flow.· Firstly, the mean velocity profile may be liable to local instability, somewhat analogous to instability of laminar flow.· The turbulence is being kept going by the working of this against the mean velocity gradient.· The Figure shows the mean height velocity during each year according to severity of gastrointestinal symptoms.· No differences in mean linear growth velocities were found between males and females or among patients stratified by anatomical localisation of disease.· Reciprocal motion Reciprocal motion, positive and negative at constant mean velocity, is unnerving, mechanistic and inhuman.· In most turbulent flows, for example, only the mean velocity can be measured with a Pitot tube.
· That way it might be easier to match relative velocities for a few seconds.· Their impact energy per gram increases with the square of their relative velocity.· When this Doppler shift is converted to relative velocity it turns out that the velocity varies sinusoidally with time.
NOUN· As the star shrank, the gravitational field at the surface would become stronger and the escape velocity would increase.· Some of the gases from the explosion and fireball may reach escape velocity.· This critical speed is called the escape velocity.· A significant fraction of their water content can emerge from the explosion at a speed below the escape velocity of Mercury.· As the radius of the star is reduced the escape velocity increases until eventually it reaches the velocity of light.· In fact, it is traveling well above escape velocity.· Jupiter is a very massive planet, and its escape velocity is correspondingly high.· Even modest-sized impactors can blast atmospheric gases off of Mars at speeds above escape velocity.
· The investigation of the flow past obstacles or of boundary layers requires a uniform flow with minimal velocity fluctuations.· At large r the velocity fluctuations become independent of one another and R asymptotically approaches 0.· Figure 21.4 shows oscillograms of the velocity fluctuations at different distances from the centre line of a wake.· Figure 24.9 shows vertical velocity fluctuations in a different Bénard experiment.· In principle, of course, correlations involving the pressure fluctuations as well as the velocity fluctuations may be formulated.· The flow outside the interface, although called non-turbulent, does involve velocity fluctuations.· This term represents the action of the velocity fluctuations on the mean flow arising from the non-linearity of the Navier-Stokes equation.· However, these velocity fluctuations are entirely irrotational and are dynamically quite different from turbulent fluctuations.
· The final technique for producing a velocity profile involves a voltage.controlled oscillator with the controlling voltage generated by an analogue circuit.· Firstly, the mean velocity profile may be liable to local instability, somewhat analogous to instability of laminar flow.· These changes arise from changes in the laminar velocity profile.· It is likely that these coherent structures originate through an intermittent instability of the velocity profile.· The look.up table entries can be calculated, using the methods described in Section 6.3 to determine the optimum velocity profile.· Figure 21.26 shows velocity profiles at two distances downstream from the start of the heated section.· Simultaneously, they interact with the mean flow, so that the velocity profile also has three-dimensional variations.· Derive the velocity profile for optimum acceleration of this system.
· Calculations of frequency and wave velocity of motility could be derived directly from the screen.
VERB· In consequence the use of sedimentation columns or tubes to determine the fall velocities of sediment particles has become very popular.· The look.up table entries can be calculated, using the methods described in Section 6.3 to determine the optimum velocity profile.
· Maintaining a given velocity round a curve requires acceleration towards the centre of curvature.
· A spacecraft at point A carries out a burn that increases its horizontal velocity.· In the Jupiter fly-by, the ship had used the gravitational field of the planet to increase her velocity.· This is exactly the case of NBFIs increasing velocity that we discussed above.· The subsequent path it takes will depend on whether the A V increased or decreased the velocity.· The wind had increased in velocity and was now a low, angry howl.
· The more precisely you measure the position of a particle, the less precisely you can measure its velocity, and viceversa.
· There were early experiments, some of them successful, in which objects moving at high velocity were arrested by the camera.· He was in no hurry, and it was dangerous to move at a high velocity so near the ship.· How is it that observers moving with different uniform velocities can be equivalent with respect to Minkowskian geometry?
· As the radius of the star is reduced the escape velocity increases until eventually it reaches the velocity of light.· Some of the gases from the explosion and fireball may reach escape velocity.· As the sun shrinks it rotates faster, and flings off its outer, much cooler shell when it reaches escape velocity.
the velocity of light The speedboat reached a velocity of 120 mph. a high velocity bullet2[uncountable] a high speed: Martinez had good velocity on his fastball.