Definition of "fast"

adjective:
- Able to transfer data in a short period of time.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
adverb:
- Ahead of the correct time or schedule.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
noun:
- A train that calls at only some stations it passes between its origin and destination, typically just the principal stations.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- The act or practice of abstaining from food or of eating very little food.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
- The period of time during which one abstains from or eats very little food.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
interjection:
- Short for "stand fast", a warning not to pass between the arrow and the target.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License
verb:
- To abstain from or eat very little food; to abstain from food for religious or medical reasons.
  
  from Wiktionary, Creative Commons Attribution/Share-Alike License