Definitions for fast

(abstaining from food)

(abstain from certain foods, as for religious or medical reasons; "Catholics sometimes fast during Lent")

(abstain from eating; "Before the medical exam, you must 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")

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

(at a rapid tempo; "the band played a fast fox trot")

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

(resistant to destruction or fading; "fast colors")

(unrestrained by convention or morality; "Congreve draws a debauched aristocratic society"; "deplorably dissipated and degraded"; "riotous living"; "fast women")

(hurried and brief; "paid a flying visit"; "took a flying glance at the book"; "a quick inspection"; "a fast visit")

(securely fixed in place; "the post was still firm after being hit by the car")

(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")

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

(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")

(firmly or closely; "held fast to the rope"; "her foot was stuck fast"; "held tight")