Hyper Dictionary

English Dictionary Computer Dictionary Video Dictionary Thesaurus Dream Dictionary Medical Dictionary

Search Dictionary:  

Meaning of VELOCITY

Pronunciation:  vu'lâsitee

WordNet Dictionary
[n]  distance travelled per unit time

VELOCITY is a 8 letter word that starts with V.


 Synonyms: speed
 See Also: airspeed, c, escape velocity, groundspeed, hypervelocity, light speed, muzzle velocity, rate, speed of light, steerageway, terminal velocity



Webster's 1913 Dictionary
\Ve*loc"i*ty\, n.; pl. {Velocities}. [L. velocitas,
from velox, -ocis, swift, quick; perhaps akin to v?lare to
fly (see {Volatile}): cf. F. v['e]locit['e].]
1. Quickness of motion; swiftness; speed; celerity; rapidity;
   as, the velocity of wind; the velocity of a planet or
   comet in its orbit or course; the velocity of a cannon
   ball; the velocity of light.

Note: In such phrases, velocity is more generally used than
      celerity. We apply celerity to animals; as, a horse or
      an ostrich runs with celerity; but bodies moving in the
      air or in ethereal space move with greater or less
      velocity, not celerity. This usage is arbitrary, and
      perhaps not universal.

2. (Mech.) Rate of motion; the relation of motion to time,
   measured by the number of units of space passed over by a
   moving body or point in a unit of time, usually the number
   of feet passed over in a second. See the Note under

{Angular velocity}. See under {Angular}.

{Initial velocity}, the velocity of a moving body at
   starting; especially, the velocity of a projectile as it
   leaves the mouth of a firearm from which it is discharged.

{Relative velocity}, the velocity with which a body
   approaches or recedes from another body, whether both are
   moving or only one.

{Uniform velocity}, velocity in which the same number of
   units of space are described in each successive unit of

{Variable velocity}, velocity in which the space described
   varies from instant, either increasing or decreasing; --
   in the former case called accelerated velocity, in the
   latter, retarded velocity; the acceleration or retardation
   itself being also either uniform or variable.

{Virtual velocity}. See under {Virtual}.

Note: In variable velocity, the velocity, strictly, at any
      given instant, is the rate of motion at that instant,
      and is expressed by the units of space, which, if the
      velocity at that instant were continued uniform during
      a unit of time, would be described in the unit of time;
      thus, the velocity of a falling body at a given instant
      is the number of feet which, if the motion which the
      body has at that instant were continued uniformly for
      one second, it would pass through in the second. The
      scientific sense of velocity differs from the popular
      sense in being applied to all rates of motion, however
      slow, while the latter implies more or less rapidity or
      quickness of motion.

Syn: Swiftness; celerity; rapidity; fleetness; speed.

Biology Dictionary
  1. The time rate of motion; the distance traveled divided by the time required to travel that distance.
  2. The time rate of motion; the distance traveled divided by the time required to travel that distance.