Definition of Fast

1. Noun. Abstaining from food.

Exact synonyms: Fasting
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"
Specialized synonyms: Diet
Generic synonyms: Abstain, Desist, Refrain
Derivative terms: Fasting

3. Adjective. Acting or moving or capable of acting or moving quickly. "A fast car"

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"
Specialized synonyms: Diet
Generic synonyms: Abstain, Desist, Refrain
Derivative terms: Fasting

6. Adjective. (used of timepieces) indicating a time ahead of or later than the correct time. "My watch is fast"
Antonyms: Slow

7. Adverb. Firmly or closely. "Held tight"
Exact synonyms: Tight

8. Adjective. At a rapid tempo. "The band played a fast fox trot"
Category relationships: Music
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"
Similar to: Smooth

10. Adjective. Resistant to destruction or fading. "Fast colors"
Similar to: Imperviable, Impervious

11. Adjective. Unrestrained by convention or morality. "Fast women"

12. Adjective. Hurried and brief. "A fast visit"
Exact synonyms: Flying, Quick
Similar to: Hurried
Derivative terms: Fastness, Quickness

13. Adjective. Securely fixed in place. "The post was still firm after being hit by the car"
Exact synonyms: Firm, Immobile
Similar to: Fixed
Derivative terms: Fastness, Firmness, Immobility

14. Adjective. Unwavering in devotion to friend or vow or cause. "Fast friends"
Exact synonyms: Firm, Loyal, Truehearted
Similar to: Faithful
Derivative terms: Firmness

15. Adjective. (of a photographic lens or emulsion) causing a shortening of exposure time. "A fast lens"
Similar to: Causative

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. Verb. (intransitive) to abstain from or eat very little food; to abstain from food for religious or medical reasons ¹

2. Noun. The act or practice of abstaining from food or of eating very little food ¹

3. Noun. The period of time during which one abstains from or eats very little food ¹

4. Adjective. firmly or securely fixed in place; stable (defdate from 9th c.) ¹

5. Adjective. Of people: steadfast, with unwavering feeling. (Now only in set phrases like "fast friend".) (defdate from 10th c.) ¹

6. Adjective. Moving with great speed, or capable of doing so; swift, rapid (defdate from 14th c.) ¹

7. Adjective. (computing of a piece of hardware) Able to transfer data in a short period of time ¹

8. Adjective. deep or sound (of sleep); fast asleep (of people) (defdate 16th-19th c.) ¹

9. Adjective. Of dyes or colours: not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent (defdate from 17th c.) ¹

10. Adjective. (colloquial) Having an extravagant lifestyle or immoral habits (defdate from 18th c.) ¹

11. Adjective. ahead of the correct time or schedule (defdate from 19th c.) ¹

12. Adjective. (context: of photographic film) More sensitive to light than average (defdate from 20th c.) ¹

13. Adverb. In a firm or secure manner, securely; in such a way as not to be moved (defdate from 10th c.) ¹

14. Adverb. (context: of sleeping) deeply or soundly (defdate from 13th c.) ¹

15. Adverb. Immediately following in place or time; close, very near (defdate from 13th c.) ¹

16. Adverb. quickly, with great speed; within a short time (defdate from 13th c.) ¹

17. Adverb. ahead of the correct time or schedule ¹

18. Noun. (British rail transport) A train that calls at only some stations it passes between its origin and destination, typically just the principal stations ¹

19. Interjection. (archery) Short for "stand fast", a warning not to pass between the arrow and the target ¹

¹ Source:

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)

Lexicographical Neighbors of Fast

fast (current term)
fast Fourier transform
fast Fourier transforms
fast and furious
fast asleep
fast asleep(p)

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