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Definition of Fast
1. Noun. Abstaining from food.
Generic synonyms: Abstinence
Specialized synonyms: Diet, Dieting, Hunger Strike, Ramadan
2. Verb. Abstain from certain foods, as for religious or medical reasons. "Catholics sometimes fast during Lent"
3. Adjective. Acting or moving or capable of acting or moving quickly. "A fast car"
Similar to: Accelerated, Alacritous, Blistering, Hot, Red-hot, Double-quick, Express, Fast-breaking, Fast-paced, Fleet, Swift, High-speed, High-velocity, Hurrying, Scurrying, Immediate, Prompt, Quick, Straightaway, Instant, Instantaneous, Meteoric, Quick, Speedy, Rapid, Rapid, Speedy, Smart, Winged, Windy
Also: Sudden, Hurried
Derivative terms: Fastness
Antonyms: Slow
4. Adverb. Quickly or rapidly (often used as a combining form). "Fast-opening (or fast-closing) shutters"
5. Verb. Abstain from eating. "Before the medical exam, you must fast"
6. Adjective. (used of timepieces) indicating a time ahead of or later than the correct time. "My watch is fast"
7. Adverb. Firmly or closely. "Held tight"
8. Adjective. At a rapid tempo. "The band played a fast fox trot"
Similar to: Allegro, Allegretto, Andantino, Presto, Prestissimo, Vivace
Derivative terms: Fastness
Antonyms: Slow
9. Adjective. (of surfaces) conducive to rapid speeds. "Grass courts are faster than clay"
10. Adjective. Resistant to destruction or fading. "Fast colors"
11. Adjective. Unrestrained by convention or morality. "Fast women"
Similar to: Immoral
Derivative terms: Degenerate, Dissoluteness, Libertine, Profligate, Riot
12. Adjective. Hurried and brief. "A fast visit"
13. Adjective. Securely fixed in place. "The post was still firm after being hit by the car"
14. Adjective. Unwavering in devotion to friend or vow or cause. "Fast friends"
15. Adjective. (of a photographic lens or emulsion) causing a shortening of exposure time. "A fast lens"
Definition of Fast
1. v. i. To abstain from food; to omit to take nourishment in whole or in part; to go hungry.
2. n. Abstinence from food; omission to take nourishment.
3. a. Firmly fixed; closely adhering; made firm; not loose, unstable, or easily moved; immovable; as, to make fast the door.
4. adv. In a fast, fixed, or firmly established manner; fixedly; firmly; immovably.
5. n. That which fastens or holds; especially, (Naut.) a mooring rope, hawser, or chain; - - called, according to its position, a bow, head, quarter, breast, or stern fast; also, a post on a pier around which hawsers are passed in mooring.
6. a. In such a condition, as to resilience, etc., as to make possible unusual rapidity of play or action; as, a fast racket, or tennis court; a fast track; a fast billiard table, etc.
Definition of Fast
1. moving or able to move quickly [adj FASTER, FASTEST] / to abstain from eating [v -ED, -ING, -S]
Medical Definition of Fast
1. 1. Firmly fixed; closely adhering; made firm; not loose, unstable, or easily moved; immovable; as, to make fast the door. "There is an order that keeps things fast." (Burke) 2. Firm against attack; fortified by nature or art; impregnable; strong. "Outlaws . . . Lurking in woods and fast places." (Spenser) 3. Firm in adherence; steadfast; not easily separated or alienated; faithful; as, a fast friend. 4. Permanent; not liable to fade by exposure to air or by washing; durable; lasting; as, fast colours. 5. Tenacious; retentive. "Roses, damask and red, are fast flowers of their smells." (Bacon) 6. Not easily disturbed or broken; deep; sound. "All this while in a most fast sleep." (Shak) 7. Moving rapidly; quick in mition; rapid; swift; as, a fast horse. 8. Given to pleasure seeking; disregardful of restraint; reckless; wild; dissipated; dissolute; as, a fast man; a fast liver. Fast and loose, now cohering, now disjoined; inconstant, especially. In the phrases to play at fast and loose, to play fast and loose, to act with giddy or reckless inconstancy or in a tricky manner; to say one thing and do another "Play fast and loose with faith." . Fast and loose pulleys, to make secure; to fasten firmly, as a vessel, a rope, or a door. Origin: OE, firm, strong, not loose, AS. Fst; akin to OS. Fast, D. Vast, OHG. Fasti, festi, G. Fest, Isel. Fastr, Sw. & Dan. Fast, and perh. To E. Fetter. The sense swift comes from the idea of keeping close to what is pursued; a Scandinavian use. Cf. Fast, adv, Fast, v, Avast. 1. In a fast, fixed, or firmly established manner; fixedly; firmly; immovably. "We will bind thee fast." (Judg. Xv. 13) 2. In a fast or rapid manner; quickly; swiftly; extravagantly; wildly; as, to run fast; to live fast. Fast by, or Fast beside, close or near to; near at hand. "He, after Eve seduced, unminded slunk Into the wood fast by." (Milton) "Fast by the throne obsequious Fame resides." (Pope) Origin: OE. Faste firmly, strongly, quickly, AS. Faste. See Fast. Source: Websters Dictionary (01 Mar 1998)