English-Thai Dictionary

velocity

N ความเร็ว  ความ รวดเร็ว  rapidity speed swiftness quickness rapidity kwam-reo

 

velocity

N อัตราความเร็ว  ad-tra-kwam-reo

 

Webster's 1828 Dictionary

VELOCITY

n.[L. velositas, from velox, swift, allied to volo, to fly. ] 1. Swiftness; 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. In these phrases, velocity is more generally used than celerity. We apply celerity to animals; as, a horse or an ostrich runs with celerity, and a stream runs with rapidity or velocity; but bodies moving in the air or in etherial space, move with greater or less velocity, not celerity. This usage is arbitrary, and perhaps not universal.
2. In philosophy, velocity is that affection of motion by which a body moves over a certain space in a certain time. Velocity is in direct proportion to the space over which a body moves. Velocity is absolute or relative; absolute, when a body moves over a certain space in a certain time; relative, when it has respect to another moving body. Velocity is also uniform or equal; or it is unequal, that is, retarded or accelerated.

 

Webster's 1913 Dictionary

VELOCITY

Ve *loc "i *ty, n.; pl. Velocities. Etym: [L. velocitas, from velox, -ocis, swift, quick; perhaps akin to v to fly (see Volatile ): cf. F. vélocité. ]

 

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. )

 

Defn: 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. 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.

 

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.

 

New American Oxford Dictionary

velocity

ve loc i ty |vəˈläsətē vəˈlɑsədi | ▶noun ( pl. velocities ) the speed of something in a given direction: the velocities of the emitted particles. • (in general use ) speed: the tank shot backward at an incredible velocity. • (also velocity of circulation ) Economics the rate at which money changes hands within an economy. ORIGIN late Middle English: from French vélocité or Latin velocitas, from velox, veloc- ‘swift. ’

 

velocity profile

vel |ocity pro |file ▶noun Physics the variation in velocity along a line at right angles to the general direction of flow.

 

Oxford Dictionary

velocity

velocity |vɪˈlɒsɪti | ▶noun ( pl. velocities ) the speed of something in a given direction: the velocities of the emitted particles. • (in general use ) speed: the tank shot backwards at an incredible velocity. • (also velocity of circulation ) Economics the rate at which money changes hands within an economy. ORIGIN late Middle English: from French vélocité or Latin velocitas, from velox, veloc- ‘swift ’.

 

velocity profile

vel |ocity pro |file ▶noun Physics the variation in velocity along a line at right angles to the general direction of flow.

 

American Oxford Thesaurus

velocity

velocity noun light travels at a constant velocity: speed, pace, rate, tempo, momentum, impetus; swiftness, rapidity; literary fleetness, celerity.

 

Oxford Thesaurus

velocity

velocity noun light always travels at the same constant velocity: speed, pace, rate, tempo, momentum, impetus; swiftness, swift /fast pace, fastness, quickness, speediness, rapidity, briskness, expeditiousness, expedition, dispatch; acceleration; informal clip, fair old rate, fair lick, steam, nippiness; literary fleetness, celerity.

 

Sanseido Wisdom Dictionary

velocity

ve loc i ty /vəlɑ́səti |-lɔ́s -/名詞 複 -ties 1 U ｟主にかたく ｠〖時にa ～〗速さ, 速力 ; 高速 ; 急速さ ▸ at a velocity of a mile a minute 毎分1マイルの速さで ▸ fly with the velocity of sound 音速で飛ぶ .2 U C 〘物理 〙速度 (!speedと違い方向性を持つ ) ▸ initial velocity (弾丸の )初速度 .