What is the meaning of speed?

noun

• Distance travelled per unit time.
  • synonyms: velocity
• A rate (usually rapid) at which something happens.
  • usage: "the project advanced with gratifying speed"
  • synonyms: swiftness, fastness
• Changing location rapidly.
  • synonyms: speeding, hurrying
• The ratio of the focal length to the diameter of a (camera) lens system.
  • synonyms: focal ratio, f number, stop number
• 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

• Move fast.
  • usage: "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, step on it
• Move faster.
  • usage: "The car accelerated"
  • synonyms: accelerate, speed up, quicken
• Move very fast.
  • usage: "The runner zipped past us at breakneck speed"
  • synonyms: travel rapidly, hurry, zip
• Travel at an excessive or illegal velocity.
  • usage: "I got a ticket for speeding"
• Cause to move faster.
  • usage: "He accelerated the car"
  • synonyms: accelerate, speed up