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Definition of "speed" []

  • Physics The rate or a measure of the rate of motion, especially: (noun)
  • Physics Distance traveled divided by the time of travel. (noun)
  • Physics The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time. (noun)
  • Physics The magnitude of a velocity. (noun)
  • Swiftness of action. (noun)
  • The act or quality of acting or moving fast; rapidity (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • The rate at which something moves, is done, or acts (noun)
  • 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 (noun)
  • A rate of rotation, usually expressed in revolutions per unit time (noun)
  • A gear ratio in a motor vehicle, bicycle, etc (noun)
  • (in combination) (noun)
  • A numerical expression of the sensitivity to light of a particular type of film, paper, or plate (noun)
  • 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 (noun)
  • Prosperity or success (noun)
  • To move or go or cause to move or go quickly (verb)
  • To drive (a motor vehicle) at a high speed, esp above legal limits (verb)
  • To help further the success or completion of (verb)
  • To take or be under the influence of amphetamines (verb)
  • To operate or run at a high speed (verb)
  • To prosper or succeed (verb)
  • To wish success to (verb)

www.Collinsdictionary.com (c) HarperCollins Publishers Ltd 2016

Use "speed" in a sentence
  • "How to speed up and decrease speed: the zoom up/down the viewer (press the "Ctrl+Alt+middle mouse"),"
  • "Now long track speed skating kencook @walidmrealtor he was definitely * speed* skating!"
  • "The reduction in speed is likely due to the reduction in commuting drivers, and of course, a reduction in collisions would follow from any reduction in traffic."