fast

Verb

• abstain from eating
  • Before the medical exam, you must fast
    

• abstain from certain foods, as for religious or medical reasons
  • Catholics sometimes fast during Lent
    

Adjective

• (of a photographic lens or emulsion) causing a shortening of exposure time
  • a fast lens
    

• unwavering in devotion to friend or vow or cause
  • a firm ally
    
  • loyal supporters
    
  • the true-hearted soldier...of Tippecanoe- Campaign song for William Henry Harrison
    
  • fast friends
    

• securely fixed in place
  • the post was still firm after being hit by the car
    

• hurried and brief
  • paid a flying visit
    
  • took a flying glance at the book
    
  • a quick inspection
    
  • a fast visit
    

• unrestrained by convention or morality
  • Congreve draws a debauched aristocratic society
    
  • deplorably dissipated and degraded
    
  • riotous living
    
  • fast women
    

• resistant to destruction or fading
  • fast colors
    

• (of surfaces) conducive to rapid speeds
  • a fast road
    
  • grass courts are faster than clay
    

• at a rapid tempo
  • the band played a fast fox trot
    

• (used of timepieces) indicating a time ahead of or later than the correct time
  • my watch is fast
    

• acting or moving or capable of acting or moving quickly
  • fast film
    
  • on the fast track in school
    
  • set a fast pace
    
  • a fast car
    

Noun

• abstaining from food

Adverb

• firmly or closely
  • held fast to the rope
    
  • her foot was stuck fast
    
  • held tight
    

• quickly or rapidly (often used as a combining form)
  • how fast can he get here?
    
  • ran as fast as he could
    
  • needs medical help fast
    
  • fast-running rivers
    
  • fast-breaking news
    
  • fast-opening (or fast-closing) shutters
    

Related words

• Synonyms: 
  firm , loyal , truehearted , fast(a) , immobile , flying , quick , debauched , degenerate , degraded , dissipated , dissolute , libertine , profligate , riotous , fasting , tight