Definition of FAST

  1. (verb)abstain from certain foods, as for religious or medical reasons
  2. (verb)abstain from eating
  3. (noun)abstaining from food
  4. (adj)(of surfaces) conducive to rapid speeds
  5. (adj)resistant to destruction or fading
  6. (adj)unrestrained by convention or morality
  7. (adj)hurried and brief
  8. (adj)securely fixed in place
  9. (adj)unwavering in devotion to friend or vow or cause
  10. (adj)(of a photographic lens or emulsion) causing a shortening of exposure time
  11. (adj)acting or moving or capable of acting or moving quickly
  12. (adj)(used of timepieces) indicating a time ahead of or later than the correct time
  13. (adj)at a rapid tempo
  14. (adv)quickly or rapidly (often used as a combining form)
  15. (adv)firmly or closely