Velocity
Velocity 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].] [1913 Webster] 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. [1913 Webster]

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. [1913 Webster]

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 {Speed}. [1913 Webster]

{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 time.

{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}. [1913 Webster]

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. [1913 Webster]

Syn: Swiftness; celerity; rapidity; fleetness; speed. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Synonyms:

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  • Velocity — (dt. Geschwindigkeit) bezeichnet bei anschlagsdynamischen elektronischen Tasteninstrumenten (z. B. Synthesizer oder Keyboards) die sogenannte Anschlagsgeschwindigkeit, d. h. diejenige Geschwindigkeit, mit der eine Taste niedergedrückt… …   Deutsch Wikipedia

  • velocity — index haste, rate Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • velocity — 1550a, from L. velocitatem (nom. velocitas) swiftness, speed, from velox (gen. velocis) swift, of uncertain origin, perhaps related to vehere carry (see VEHICLE (Cf. vehicle)), or from the same root as vegetable (see VIGIL (Cf. vigil)) …   Etymology dictionary

  • velocity — *speed, momentum, impetus, pace, headway Analogous words: *celerity, legerity, alacrity: *haste, hurry, expedition, dispatch …   New Dictionary of Synonyms

  • velocity — [n] speed acceleration, celerity, dispatch, expedition, fleetness, gait, haste, headway, hurry, impetus, momentum, pace, quickness, rapidity, rapidness, rate, swiftness, tempo; concepts 755,792 …   New thesaurus

  • velocity — ► NOUN (pl. velocities) 1) the speed of something in a given direction. 2) (in general use) speed. ORIGIN Latin velocitas, from velox swift …   English terms dictionary

  • velocity — [və läs′ə tē] n. pl. velocities [Fr vélocité < L velocitas < velox: see VELOCIPEDE] 1. quickness or rapidity of motion or action; swiftness; speed 2. a) rate of change of position, in relation to time; SPEED (sense 2a) b) …   English World dictionary

  • Velocity — In physics, velocity is defined as the rate of change of position. It is a vector physical quantity; both speed and direction are required to define it. In the SI (metric) system, it is measured in meters per second: (m/s) or ms 1. The scalar… …   Wikipedia

  • velocity — 1) a vector quantity equal to the rate that position changes with time 2) velocity of a point in a vibrating system is the time rate of change of its displacement. ambient wind velocity forward velocity impact velocity lateral velocity… …   Mechanics glossary

  • Velocity — (Roget s Thesaurus) < N PARAG:Velocity >N GRP: N 1 Sgm: N 1 velocity velocity speed celerity Sgm: N 1 swiftness swiftness &c. >Adj. Sgm: N 1 rapidity rapidity eagle speed Sgm: N 1 expedition expedition …   English dictionary for students

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