There are 2 definitions of fast in English:

fast1

Syllabification: fast
Pronunciation: /fast
 
/

adjective

1Moving or capable of moving at high speed: a fast and powerful car
More example sentences
  • The big key to Daytona is making sure you have a fast car that is capable of getting out front and staying there.
  • Jamie was into speed, he liked fast cars and the adrenaline rush of living life on the edge.
  • Am I just different to the norm since I have never been a great lover of watching fast cars speeding around a piece of tarmac for an hour and a half?
1.1Performed or taking place at high speed; taking only a short time: the journey was fast and enjoyable
More example sentences
  • On the one hand they can offer perfectly crafted pieces of writing just right for fast and enjoyable consumption.
  • Trainer Mark Hampton says that the fights are very fast and aggressive, in a series of short two-minute rounds.
  • On the one hand, everything has to be very fast and superficial - a sound bite that you can grab in a second.
1.2Performing or able to perform a particular type of action quickly: a fast reader
More example sentences
  • Yorkshire are waiting for a fitness report which will reveal if the fast bowler will be able to play tomorrow.
  • But this is a very fast printer able to cope with heavy workloads.
  • He was a fast learner, able to look back at his own mistakes and improve.
1.3Allowing people or things to move at high speed: a wide, fast road
More example sentences
  • The first mistake was to choose indoor carpet, a fast surface, that suited Leander's serve and volley game.
  • It's not a high-speed circuit, there are not many fast corners.
  • Our fastest roads (our motorways) are also our safest.
1.4(Of a playing field) likely to make the ball bounce or run quickly or to allow competitors to reach a high speed.
More example sentences
  • Taking the fast outfield into consideration, fans could be in for a rather heavy-scoring game.
  • Both batsmen got in some early practice, taking advantage of friendly bowling from the PCA XI and a fast outfield.
  • The surface of the pitch was outstanding and the outfield was fast and true.
2 [predic. or as complement] (Of a clock or watch) showing a time ahead of the correct time: I keep my watch fifteen minutes fast
More example sentences
  • Perhaps our watches were a little fast, or our internal clocks had been affected by the huge amount of alcohol in our systems.
  • The calendar is loaded, the meter is ticking and that damn clock has to be fast, doesn't it?
  • It's 2:30 by my watch (though my watch is a bit fast), and we're still in Portland.
3Firmly fixed or attached: he made a rope fast to each corner
More example sentences
  • Dockhands caught the lines and pulled the ship in and made it fast.
  • We sent boats with ropes and hawsers to the rocks, wound a rope round a rock, made a hawser fast to the rope, and swung to it with a length of hawser.
Synonyms
secure, fastened, tight, firm, closed, shut; immovable, unbudgable
3.1(Of friends) close and loyal.
More example sentences
  • JJ and I had become fast friends, not as close as Dane and I were but close enough.
  • She became fast friends with Alicia, since she was closer in age than the rest of the sisters.
  • They fought the Soviets together and are fast friends.
Synonyms
3.2(Of a dye) not fading in light or when washed.
More example sentences
  • From the tubes, a not so fast dye is extracted for colouring silk.
  • The setup had to be optimized for response times below microseconds by using a fast dye and by applying a fast fluorescence detector.
  • All those shops selling these goods have to give consumers the assurance that they are fast colour, non-shrinkable and correct size.
Synonyms
indelible, lasting, permanent, stable
4 Photography (Of a film) needing only a short exposure.
More example sentences
  • Again this is where you use the fast film and enlarge for the portrait.
  • This was big-time exposure country, and had I known in advance I would have brought my tripod and a stock of fast film!
  • It's a good idea in any case to have a selection of slow, medium and fast film on hand at all times.
4.1(Of a lens) having a large aperture and therefore allowing short exposure times.
More example sentences
  • So depending on the lighting conditions you may need to use fast lenses and/or high speed film.
  • It should be lighter, with a fairly fast lens, and reasonable responsiveness and battery life.
  • Obviously you will want to use your fastest lens, let me know what it is and I will try to suggest a film for you to use.
5(Of a person or lifestyle) engaging in or involving exciting or shocking activities: the fast life she led in London
More example sentences
  • Mumbai, on the other hand, was used to money and a fast lifestyle.
  • Lack of strong family bonds and fast lifestyle also contribute to this habit.
  • Reid is one such fellow, his name frequently prompting the response 'Who?', even from those of his compatriots with a passing interest in wheels and fast living.
Synonyms
promiscuous, licentious, dissolute, debauched, impure, unchaste, wanton, abandoned, of easy virtue; sluttish, whorish; intemperate, immoderate, shameless, sinful, immoral
informal easy
dated loose

adverb

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1At high speed: he was driving too fast
More example sentences
  • Responsible drivers know that driving very fast or recklessly will endanger their life and other people's.
  • I stalled and swore, went too fast or too slow, but he was patient and spoke to me in soothing tones.
  • At that point, the US share market had been growing extremely fast for several years.
Synonyms
quickly, rapidly, swiftly, speedily, briskly, at speed, at full tilt; hastily, hurriedly, in a hurry, posthaste, pell-mell; like a shot, like a flash, on the double, at the speed of light
informal lickety-split, pretty damn quick, PDQ, nippily, like (greased) lightning, hell-bent for leather, like mad, like the wind, like a bat out of hell, at warp speed
literary apace
1.1Within a short time: they think they’re going to get rich fast
More example sentences
  • The news spread fast and the crowds became a crush within a few hours.
  • Everything happened really fast, there was a lot of people.
  • He spoke of his days in the school and how fast the fifteen years since he left had gone.
2So as to be hard to move; firmly or securely: the ship was held fast by the anchor chain
More example sentences
  • It's no use, the door's stuck fast!
  • Maybe you are like an idol to her to have her cling to you so fast.
  • Why is the anchor stuck so fast in the wreckage?
Synonyms
2.1(Of someone or something sleeping) so as to be hard to wake: they were too fast asleep to reply
More example sentences
  • I thought nothing of flopping onto the hotel bed and falling fast asleep.
  • The buzzers would go off in the night and when the nurses came to see what was wrong they would find the patients fast asleep.
  • The woman lay fast asleep under a blanket on her bed, until the noise of the snoring outside stirred her.
Synonyms
deeply, sound, completely

Origin

Old English fæst 'firmly fixed, steadfast' and fæste 'firmly, securely' In Middle English the adverb developed the senses 'strongly, vigorously' (compare with run hard), and 'close, immediate' (just surviving in the archaic and poetic fast by; compare with hard by), hence 'closely, immediately' and 'quickly'; the idea of rapid movement was then reflected in adjectival use.

Phrases

pull a fast one

informal Try to gain an unfair advantage: Joey pulled a fast one on us
More example sentences
  • It's tough when a close pal pulls a fast one on you.
  • You aren't pulling a fast one on me, are you?
  • But will customers think the fast food giant is pulling a fast one?

Definition of fast in:

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Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…

There are 2 definitions of fast in English:

fast2

Syllabification: fast
Pronunciation: /
 
fast/

verb

[no object]
Abstain from all or some kinds of food or drink, especially as a religious observance.
More example sentences
  • On inquiring, he learned that this man was fasting frequently to atone for his sins.
  • Twenty years ago she started fasting regularly because she felt a spiritual need to do so.
  • So fasting in Lent or not eating meat on Fridays seems odd, even eccentric now.
Synonyms
eat nothing, abstain from food, refrain from eating, go without food, go hungry, starve oneself; go on a hunger strike; crash-diet

noun

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An act or period of fasting: a five-day fast
More example sentences
  • On Christmas Day they can eat these things, but the rituals centre more on the last day of the fast on Christmas Eve, he says.
  • Repeated juice fasts are recommended at intervals of every two months.
  • St. Thomas lived a life of austerity; his fasts, for instance, being in marked contrast to the luxury in which he might have lived if he chose.
Synonyms
period of fasting, period of abstinence; hunger strike; diet, crash diet

Origin

Old English fæstan (verb); related to Old Norse fasta, the source of the noun.

Definition of fast in: