fast Definition in the Cambridge English Dictionary
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Definition of “fast” - English Dictionary

Definition of "fast" - American English Dictionary

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fastadjective [-er/-est only]

 us   /fæst/

fast adjective [-er/-est only] (QUICK)

moving or ​happeningquickly or ​able to move or ​happenquickly: a fast ​car The fastest way to get there is by ​plane. If ​yourwatch or ​clock is fast, it ​shows a ​timelater than the ​realtime.

fastadjective, adverb [not gradable]

 us   /fæst/

fast adjective, adverb [not gradable] (ATTACHED)

connected or ​attached in a way that is not ​easilyunfastened: Tie the ​boat fast to the ​pier.

fastverb [I]

 us   /fæst/

fast verb [I] (NOT EAT)

to have a ​period of ​time when you ​eat no ​food: We will be fasting until ​sundowntomorrow.
fast
noun [C]  us   /fæst/
They ​organized a fast to ​drawattention to the ​issue of ​hunger.

fastadverb [-er/-est only]

 us   /fæst/

fast adverb [-er/-est only] (QUICKLY)

quickly: The ​accident was caused by ​peopledriving too fast in ​badconditions. This ​type of ​wildernessarea is ​disappearing fast.
(Definition of fast from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "fast" - British English Dictionary

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fastadjective

uk   /fɑːst/  us   /fæst/

fast adjective (QUICK)

A1 moving or ​happeningquickly, or ​able to ​move or ​happenquickly: fast ​cars a fast ​swimmer Computers are getting faster all the ​time.UK The fast ​train (= one that ​stops at fewer ​stations and ​travelsquickly) to London ​takes less than an ​hour. If ​yourwatch or ​clock is fast, it ​shows a ​time that is ​later than the ​correcttime. specialized art used to refer to ​photographicfilm that ​allows you to take ​pictures when there is not much ​light or when things are ​movingquicklyfast and furious used to ​describe something that is ​full of ​speed and ​excitement: It's not a ​relaxingmovie - it's ​pretty fast and ​furious.
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fast adjective (IMMORAL)

old-fashioned disapproving without ​moralprinciples: a fast ​crowd a fast woman

fast adjective (FIXED)

If the ​colour of a ​piece of ​clothing is fast, the ​colour does not come out of the ​cloth when it is ​washed.

fastadverb

uk   /fɑːst/  us   /fæst/
A2 quickly: The ​accident was ​caused by ​peopledriving too fast in ​badconditions. You'll have to ​act fast. Children's ​publishing is a fast-growing ​business.
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fastadverb, adjective

uk   /fɑːst/  us   /fæst/

fastnoun [C]

uk   /fɑːst/  us   /fæst/
a ​period of ​time when you ​eat no ​food: Hundreds of ​prisonersbegan a fast in ​protest about ​prisonconditions.

fastverb [I]

uk   /fɑːst/  us   /fæst/
to ​eat no ​food for a ​period of ​time: One ​day a ​week he fasts for ​healthreasons.
(Definition of fast from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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