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"
at a rapid tempo; "the band played a fast fox trot"
(used of timepieces) indicating a time ahead of or later than the correct time; "my watch is fast"
securely fixed in place; "the post was still firm after being hit by the car"
resistant to destruction or fading; "fast colors"
(of surfaces) conducive to rapid speeds; "a fast road"; "grass courts are faster than clay"
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 tightly; "held fast to the rope"; "her foot was stuck fast"; "held tight"
abstain from eating; "Before the medical exam, you must fast"
abstain from certain foods, as for religious or medical reasons; "Catholics sometimes fast during Lent"
unrestrained by convention or morality; "Congreve draws a debauched aristocratic society"; "deplorably dissipated and degraded"; "riotous living"; "fast women"
a hidden storage space (for money or provisions or weapons)
(computer science) RAM memory that is set aside as a specialized buffer storage that is continually updated; used to optimize data transfers between system elements with different characteristics
a word that expresses a meaning opposed to the meaning of another word, in which case the two words are antonyms of each other; "to him the antonym of `gay' was `depressed'"