definition of
fast

[1] #1 fast a. 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". wn

[2] #2 fast r. 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". wn

[3] #3 fast n. [fasting] abstaining from food. wn

[4] #4 fast r. [tight] firmly or closely; "held fast to the rope"; "her foot was stuck fast"; "held tight". wn

[5] #5 fast v. abstain from certain foods, as for religious or medical reasons; "Catholics sometimes fast during Lent". wn