1. (adj) fast, fasting
abstaining from food
2. (adj) 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"
3. (adj) fast
(used of timepieces) indicating a time ahead of or later than the correct time
"my watch is fast"
4. (adj) fast
at a rapid tempo
"the band played a fast fox trot"
5. (adj) fast
(of surfaces) conducive to rapid speeds
"a fast road"; "grass courts are faster than clay"
6. (adj) fast
resistant to destruction or fading
"fast colors"
7. (adj) debauched, degenerate, degraded, dissipated, dissolute, libertine, profligate, riotous, fast
unrestrained by convention or morality
"Congreve draws a debauched aristocratic society"; "deplorably dissipated and degraded"; "riotous living"; "fast women"
8. (adj) flying, quick, fast
hurried and brief
"paid a flying visit"; "took a flying glance at the book"; "a quick inspection"; "a fast visit"
9. (adj) fast, firm, immobile
securely fixed in place
"the post was still firm after being hit by the car"
10. (adj) firm, loyal, truehearted, fast(a)
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"
11. (verb) fast
(of a photographic lens or emulsion) causing a shortening of exposure time
"a fast lens"
12. (verb) fast
abstain from certain foods, as for religious or medical reasons
"Catholics sometimes fast during Lent"
13. (adverb) fast
abstain from eating
"Before the medical exam, you must fast"
14. (adverb) fast
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"
15. (adverb) fast, tight
firmly or closely
"held fast to the rope"; "her foot was stuck fast"; "held tight"
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Definition of 'FAST' 
