Definition of 'speed'

Noun

1. distance travelled per unit time
      Synonyms: velocity
2. a rate (usually rapid) at which something happens; "the project advanced with gratifying speed"
      Synonyms: swiftness fastness
3. changing location rapidly
      Synonyms: speeding hurrying
4. the ratio of the focal length to the diameter of a (camera) lens system
      Synonyms: focal ratio f number stop number
5. a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
      Synonyms: amphetamine pep pill upper

Verb

1. step on it; "He rushed down the hall to receive his guests"; "The cars raced down the street"
      Synonyms: rush hotfoot hasten hie race pelt along rush along cannonball along bucket along belt along
      Antonyms: linger dawdle
2. move faster; "The car accelerated"
      Synonyms: accelerate speed up quicken
      Antonyms: decelerate slow slow down slow up retard
3. travel at an excessive or illegal velocity; "I got a ticket for speeding"
4. move very fast; "The runner zipped past us at breakneck speed"
      Synonyms: travel rapidly hurry zip
5. cause to move faster; "He accelerated the car"
      Synonyms: accelerate speed up
      Antonyms: decelerate slow down

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