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The meaning of SPEED is rate of motion. How to use speed in a sentence. Synonym Discussion of Speed.
Speed definition: rapidity in moving, going, traveling, proceeding, or performing; swiftness; celerity. See examples of SPEED used in a sentence.
Speed is the magnitude of velocity (a vector), which indicates additionally the direction of motion. Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second (m/s), but the most common unit of speed in everyday usage is the kilometre per hour (km/h) or, in the US and the UK, miles per hour (mph).
speed noun (RATE OF MOVEMENT) Add to word list. B1 [ C or U ] how fast something moves: He was travelling at a speed of 90 mph. The car has a top speed of 155 miles per hour. You should lower / reduce your speed as you approach a junction. On a clear, straight road you can gather / pick up speed.
1. rapidity in moving, traveling, performing, etc.; swiftness. 2. relative rate of motion or progress: the speed of light. 3. a gear ratio in a motor vehicle or bicycle. 4. a. the sensitivity of a photographic film or paper to light. b. the length of time a shutter is opened to expose film.
The speed of something is the rate at which it happens or is done. In the late 1850s the speed of technological change quickened. Each learner can proceed at his own speed.
Definition of speed noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
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.
how fast something moves or happens: high/ low speed. He was travelling at a speed of 90 mph. Fewer examples. We were driving at full speed. He's been working to improve his speed. There's always a trade-off between speed and quality. They rounded the corner at high speed. We work at the same speed.
noun. /spid/. rate of movement/action. [countable, uncountable] the rate at which someone or something moves or travels He reduced speed and turned sharp left. The train began to pick up speed (= go faster).