| speed | | |
| n. (time) | 1. speed, velocity | distance travelled per unit time. |
| ~ angular velocity | (physics) the rate of change of the angular position of a rotating body; usually expressed in radians per second or radians per minute. |
| ~ airspeed | the speed of an aircraft relative to the air in which it is flying. |
| ~ escape velocity | the minimum velocity needed to escape a gravitational field. |
| ~ groundspeed | the speed of an aircraft relative to the ground. |
| ~ hypervelocity | excessive velocity.; "the meteorites struck the earth with hypervelocity impacts" |
| ~ muzzle velocity | the velocity of a projectile as it leaves the muzzle of a gun. |
| ~ peculiar velocity | velocity with respect to the local standard of rest. |
| ~ radial velocity | velocity along the line of sight toward or away from the observer. |
| ~ light speed, speed of light, c | the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second. |
| ~ steerageway | (nautical) the minimum rate of motion needed for a vessel to be maneuvered. |
| ~ terminal velocity | the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity. |
| ~ rate | a magnitude or frequency relative to a time unit.; "they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected" |
| n. (attribute) | 2. fastness, speed, swiftness | a rate (usually rapid) at which something happens.; "the project advanced with gratifying speed" |
| ~ pace, rate | the relative speed of progress or change.; "he lived at a fast pace"; "he works at a great rate"; "the pace of events accelerated" |
| ~ haste, hastiness, hurriedness, hurry, precipitation | overly eager speed (and possible carelessness).; "he soon regretted his haste" |
| ~ execution speed | (computer science) the speed with which a computational device can execute instructions; measured in MIPS. |
| ~ graduality, gradualness | the quality of being gradual or of coming about by gradual stages. |
| n. (act) | 3. hurrying, speed, speeding | changing location rapidly. |
| ~ movement, move, motion | the act of changing location from one place to another.; "police controlled the motion of the crowd"; "the movement of people from the farms to the cities"; "his move put him directly in my path" |
| ~ speedup, acceleration, quickening | the act of accelerating; increasing the speed. |
| ~ deceleration | the act of decelerating; decreasing the speed.; "he initiated deceleration by braking" |
| ~ scud, scudding | the act of moving along swiftly (as before a gale). |
| n. (linkdef) | 4. f number, focal ratio, speed, stop number | the ratio of the focal length to the diameter of a (camera) lens system. |
| ~ ratio | the relative magnitudes of two quantities (usually expressed as a quotient). |
| n. (artifact) | 5. amphetamine, pep pill, speed, upper | a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression. |
| ~ amphetamine sulfate, amphetamine sulphate | a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system. |
| ~ bennie, benzedrine | a form of amphetamine. |
| ~ dexedrine, dextroamphetamine sulphate | an isomer of amphetamine (trade name Dexedrine) used as a central nervous system stimulant. |
| ~ drug of abuse, street drug | a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction. |
| ~ deoxyephedrine, meth, methamphetamine, methamphetamine hydrochloride, methedrine, shabu, chicken feed, chalk, crank, trash, glass, ice | an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant. |
| ~ excitant, stimulant drug, stimulant | a drug that temporarily quickens some vital process. |
| v. (motion) | 6. belt along, bucket along, cannonball along, hasten, hie, hotfoot, pelt along, race, rush, rush along, speed, step on it | move fast.; "He rushed down the hall to receive his guests"; "The cars raced down the street" |
| ~ go, locomote, move, travel | change location; move, travel, or proceed, also metaphorically.; "How fast does your new car go?"; "We travelled from Rome to Naples by bus"; "The policemen went from door to door looking for the suspect"; "The soldiers moved towards the city in an attempt to take it before night fell"; "news travelled fast" |
| ~ barge, push forward, thrust ahead | push one's way.; "she barged into the meeting room" |
| ~ shoot down, buck, tear, charge, shoot | move quickly and violently.; "The car tore down the street"; "He came charging into my office" |
| ~ dash, scoot, scud, dart, flash, shoot | run or move very quickly or hastily.; "She dashed into the yard" |
| v. (change) | 7. accelerate, quicken, speed, speed up | move faster.; "The car accelerated" |
| ~ brisk, brisk up, brisken | become brisk.; "business brisked up" |
| ~ deepen, intensify | become more intense.; "The debate intensified"; "His dislike for raw fish only deepened in Japan" |
| v. (motion) | 8. hurry, speed, travel rapidly, zip | move very fast.; "The runner zipped past us at breakneck speed" |
| ~ go, locomote, move, travel | change location; move, travel, or proceed, also metaphorically.; "How fast does your new car go?"; "We travelled from Rome to Naples by bus"; "The policemen went from door to door looking for the suspect"; "The soldiers moved towards the city in an attempt to take it before night fell"; "news travelled fast" |
| ~ dart, fleet, flit, flutter | move along rapidly and lightly; skim or dart.; "The hummingbird flitted among the branches" |
| ~ run | move fast by using one's feet, with one foot off the ground at any given time.; "Don't run--you'll be out of breath"; "The children ran to the store" |
| ~ whizz along, zoom, zoom along, whizz | move along very quickly. |
| v. (motion) | 9. speed | travel at an excessive or illegal velocity.; "I got a ticket for speeding" |
| ~ go, locomote, move, travel | change location; move, travel, or proceed, also metaphorically.; "How fast does your new car go?"; "We travelled from Rome to Naples by bus"; "The policemen went from door to door looking for the suspect"; "The soldiers moved towards the city in an attempt to take it before night fell"; "news travelled fast" |
| v. (change) | 10. accelerate, speed, speed up | cause to move faster.; "He accelerated the car" |
| ~ alter, change, modify | cause to change; make different; cause a transformation.; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue" |
| rapid | | |
| n. (object) | 1. rapid | a part of a river where the current is very fast. |
| ~ river | a large natural stream of water (larger than a creek).; "the river was navigable for 50 miles" |
| ~ waterway | a navigable body of water. |
| adj. | 2. rapid | done or occurring in a brief period of time.; "a rapid rise through the ranks" |
| ~ fast | acting or moving or capable of acting or moving quickly.; "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car" |
| adj. | 3. rapid, speedy | characterized by speed; moving with or capable of moving with high speed.; "a rapid movement"; "a speedy car"; "a speedy errand boy" |
| ~ fast | acting or moving or capable of acting or moving quickly.; "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car" |
| speedy | | |
| adj. | 1. quick, speedy | accomplished rapidly and without delay.; "was quick to make friends"; "his quick reaction prevented an accident"; "hoped for a speedy resolution of the problem"; "a speedy recovery"; "he has a right to a speedy trial" |
| ~ fast | acting or moving or capable of acting or moving quickly.; "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car" |
| duster | | |
| n. (phenomenon) | 1. dust storm, duster, sandstorm, sirocco | a windstorm that lifts up clouds of dust or sand.; "it was the kind of duster not experienced in years" |
| ~ windstorm | a storm consisting of violent winds. |
| n. (artifact) | 2. dust coat, duster, gabardine, gaberdine, smock | a loose coverall (coat or frock) reaching down to the ankles. |
| ~ coverall | a loose-fitting protective garment that is worn over other clothing. |
| n. (artifact) | 3. dustcloth, duster, dustrag | a piece of cloth used for dusting. |
| ~ piece of cloth, piece of material | a separate part consisting of fabric. |
| n. (act) | 4. duster | a pitch thrown deliberately close to the batter. |
| ~ pitch, delivery | (baseball) the act of throwing a baseball by a pitcher to a batter. |
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