1. Acting or moving or capable of acting or moving quickly (synset 300979699)
    "fast film"; "on the fast track in school"; "set a fast pace"; "a fast car"
  2. (used of timepieces) indicating a time ahead of or later than the correct time (synset 300986764)
    "my watch is fast"
  3. At a rapid tempo (synset 300985009)
    "the band played a fast fox trot"
  4. (of surfaces) conducive to rapid speeds (synset 302245246)
    "a fast road"; "grass courts are faster than clay"
  5. Resistant to destruction or fading (synset 301778636)
    "fast colors"
  6. Unrestrained by convention or morality (synset 301553629)
    "Congreve draws a debauched aristocratic society"; "deplorably dissipated and degraded"; "riotous living"; "fast women"
  7. Hurried and brief (synset 301273596)
    "paid a flying visit"; "took a flying glance at the book"; "a quick inspection"; "a fast visit"
  8. Securely fixed in place (synset 301063410)
    "the post was still firm after being hit by the car"
  9. Unwavering in devotion to friend or vow or cause (synset 300962433)
    "a firm ally"; "loyal supporters"; "the true-hearted soldier...of Tippecanoe"; "fast friends"
  10. (of a photographic lens or emulsion) causing a shortening of exposure time (synset 300324771)
    "a fast lens"
  1. Abstaining from food (synset 101071904)
  1. Quickly or rapidly (often used as a combining form) (synset 400086488)
    "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"
  2. Firmly or closely (synset 400086892)
    "held fast to the rope"; "her foot was stuck fast"; "held tight"
  1. Abstain from certain foods, as for religious or medical reasons (synset 201192137)
    "Catholics sometimes fast during Lent"
  2. Abstain from eating (synset 201191960)
    "Before the medical exam, you must fast"

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