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Definitions for Speed

[1] rapidity in moving, going, traveling, proceeding, or performing; swiftness; celerity: the speed of light; the speed of sound.
[2] relative rapidity in moving, going, etc.; rate of motion or progress: full speed ahead.
[3] full, maximum, or optimum rate of motion: The car gets to speed in just nine seconds.
[4] Automotive . a transmission gear ratio.
[5] Photography . Also called film speed. the sensitivity of a film or paper to light, measured by an ASA or DIN index, which assigns low numbers to slow film and higher numbers to faster film. Also called shutter speed. the length of time a shutter is opened to expose film. the largest opening at which a lens can be used.
[6] Slang . a stimulating drug, as caffeine, ephedrine, or especially methamphetamine or amphetamine.
[7] Informal . a person or thing that is compatible with or typical of one's ability, personality, desires, etc.: My speed is writing postcards on the porch while everyone else is tearing around the tennis court.
[8] Archaic . success or prosperity.
[9] to promote the success of (an affair, undertaking, etc.); further, forward, or expedite.
[10] to direct (the steps, course, way, etc.) with speed.
[11] to increase the rate of speed of (usually followed by up ): to speed up industrial production.
[12] to bring to a particular speed, as a machine.
[13] to cause to move, go, or proceed with speed.
[14] to expedite the going of: to speed the parting guest.
[15] Archaic . to cause to succeed or prosper.
[16] to move, go, pass, or proceed with speed or rapidity.
[17] to drive a vehicle at a rate that exceeds the legally established maximum: He was arrested for speeding.
[18] to increase the rate of speed or progress (usually followed by up ).
[19] to get on or fare in a specified or particular manner.
[20] Archaic . to succeed or prosper.
[21] at full /top speed , at the greatest speed possible: We drove down the highway at full speed. to the maximum of one's capabilities; with great rapidity: He worked at full speed.
[22] up to speed , operating at full or optimum speed. functioning or producing at an expected, acceptable, or competitive level; up to par: a new firm not yet up to speed.
[23] the act or quality of acting or moving fast; rapidity
[24] the rate at which something moves, is done, or acts
[25] physics a scalar measure of the rate of movement of a body expressed either as the distance travelled divided by the time taken (average speed ) or the rate of change of position with respect to time at a particular point (instantaneous speed ). It is measured in metres per second, miles per hour, etc
[26] a rate of rotation, usually expressed in revolutions per unit time
[27] a gear ratio in a motor vehicle, bicycle, etc (in combination ) a three-speed gear
[28] photog a numerical expression of the sensitivity to light of a particular type of film, paper, or plate See also ISO rating
[29] photog a measure of the ability of a lens to pass light from an object to the image position, determined by the aperture and also the transmitting power of the lens. It increases as the f-number is decreased and vice versa
[30] a slang word for amphetamine
[31] archaic prosperity or success
[32] at speed quickly
[33] up to speed operating at an acceptable or competitive level in possession of all the relevant or necessary information
[34] to move or go or cause to move or go quickly
[35] (intr) to drive (a motor vehicle) at a high speed, esp above legal limits
[36] (tr) to help further the success or completion of
[37] (intr) slang to take or be under the influence of amphetamines
[38] (intr) to operate or run at a high speed
[39] archaic (intr) to prosper or succeed (tr) to wish success to

Words related to Speed

acceleration, agility, quickness, pace, velocity, momentum, fly, advance, rush, promote, run, help, facilitate, ride, zoom, further, hurry, hasten, boost, expedite

Words nearby Speed

speechmaker, speechread, speechreading, speechway, speechwriter, speed, speed brake, speed bump, speed camera, speed chess, speed dating

Origin of Speed

before 900; 1965–70 for def 6 ; (noun) Middle English spede good luck, prosperity, rapidity, Old English spēd; cognate with Dutch spoed, Old High German spōt; akin to Old English spōwan to prosper, succeed; (v.) Middle English speden to succeed, prosper, go with speed, Old English spēdan to succeed, prosper; cognate with Old Saxon spōdian, Old High German spuoten

Other words from Speed

speed·ful , adjective
speed·ful·ly , adverb
speed·ful·ness , noun
speed·ing·ly , adverb
speed·ing·ness , noun
speed·less , adjective
mul·ti·speed , adjective
out·speed , verb (used with object), out·sped or out·speed·ed, out·speed·ing.
o·ver·speed , verb, o·ver·sped or o·ver·speed·ed, o·ver·speed·ing.

Word origin for Speed

Old English spēd (originally in the sense: success); related to spōwan to succeed, Latin spēs hope, Old Slavonic spěti to be lucky

Synonyms for Speed

acceleration, agility, momentum, pace, quickness, velocity, activity, alacrity, breeze, briskness, celerity, clip, dispatch, eagerness, expedition, fleetness, gait, haste, headway, hurry, hustle, legerity, lick, liveliness, precipitancy, precipitation, promptitude, promptness, rapidity, rapidness, readiness, rush, rustle, snap, steam, swiftness, urgency