Definition of Speed

Noun

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

Verb

• cause to move faster
  "He accelerated the car"
  accelerate - speed up
• travel at an excessive or illegal velocity
  "I got a ticket for speeding"
  
• move very fast
  "The runner zipped past us at breakneck speed"
  - travel rapidly hurry zip
• move faster
  "The car accelerated"
  accelerate - speed up quicken
• move fast
  "He rushed down the hall to receive his guests"
  "The cars raced down the street"
  rush hotfoot hasten hie race - pelt along - rush along - cannonball along - bucket along - belt along - step on it

• Scrabble® score of the speed (8)
• Word Chums® score of the speed (9)
• Words With Friends® score of the speed (9)