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- Dictionaryspeed/spiːd/
noun
- 1. the rate at which someone or something moves or operates or is able to move or operate: "we turned on to the runway and began to gather speed" Similar
- 2. each of the possible gear ratios of a bicycle or motor vehicle.
verb
- 1. move quickly: "I got into the car and home we sped" Similar Opposite
- 2. make prosperous or successful: archaic "may God speed you"
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Speed is measured as the ratio between the distance and time and the SI unit of speed is m/s. It is the change in the position of an object with respect to time. There are four types of speed: uniform speed, variable speed, average speed, and instantaneous speed.
the rate at which light or sound travels: The speed of light is 300 million metres per second. These planes travel at twice the speed of sound. [ C ] a gear :
Speed definition: rapidity in moving, going, traveling, proceeding, or performing; swiftness; celerity. See examples of SPEED used in a sentence.
Speed most often describes acceleration or a high rate of motion. When something picks up too much speed, it can run off course, like a kid on a bike zooming uncontrollably down a steep hill. Speed can be a noun or verb. As a noun, it's an indicator of pace, as in the speed of a car.
1. a. : rate of motion: such as. (1) : velocity sense 1. (2) : the magnitude of a velocity irrespective of direction. b. : the act or state of moving swiftly : swiftness. c. : impetus. 2. : swiftness or rate of performance or action : velocity sense 3a. 3. a. : the sensitivity of a photographic film, plate, or paper expressed numerically. b.
speed (originally prosperity or success) may apply to human or nonhuman activity and emphasizes the rate in time at which something travels or operates: the speed of light, of a lens, of an automobile, of thought. velocity, a more learned or technical term, is sometimes interchangeable with speed: the velocity of light; it is commonly used to ...
speed. (spēd) n. 1. Physics The rate or a measure of the rate of motion, especially: a. Distance traveled divided by the time of travel. b. The limit of this quotient as the time of travel becomes vanishingly small; the first derivative of distance with respect to time. c. The magnitude of a velocity. 2.
