speed in WordNet English dictionary

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

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