Define fast. fast synonyms, fast pronunciation, fast translation, English dictionary definition of fast. adj. fast·er , fast·est 1. Acting, moving, or capable of acting or moving quickly; swift. 2. a. Accomplished in relatively little time: a fast visit.

Fast definition, moving or able to move, operate, function, or take effect quickly; quick; swift; rapid: a fast horse;a fast pain reliever;a fast thinker. See more.

incompletely, part, partially, partly. fast. adjective. Synonyms & Antonyms of fast (Entry 2 of 4) 1 moving, proceeding, or acting with great speed. the fast pace of construction resulted in our new house being done ahead of schedule.

fast definition: 1. moving or happening quickly, or able to move or happen quickly: 2. If your watch or clock is…. Learn more.

If your watch or clock is fast, it shows a time that is later than the correct time. art specialized. used to refer to photographic film that allows you to take pictures when there is not much light or when things are moving quickly. fast and furious.

FAST: Frame-based ATM over SONET Transport: FAST: Field's Automated Sales Technology: FAST: Fleet AAW System Trainer: FAST: Firefighters Accident & Sickness Trust: FAST: Fully Automatic Systems Test: FAST: Future Area Shelterized Tower: FAST: Financial Assistance to Student of Telangana (Telangana, India) FAST: Final Assembly and System Test (space flight) FAST