Definition of “fast” - English Dictionary

“fast” in British English

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fastadjective

uk /fɑːst/ us /fæst/

fast adjective (QUICK)

A1 moving or happening quickly, or able to move or happen quickly:

fast cars
a fast swimmer
Computers are getting faster all the time.
UK The fast train (= one that stops at fewer stations and travels quickly) to London takes less than an hour.

If your watch or clock is fast, it shows a time that is later than the correct time.

specialized art 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

used to describe something that is full of speed and excitement:

It's not a relaxing movie - it's pretty fast and furious.

More examples

fastadverb

uk /fɑːst/ us /fæst/

fastadverb, adjective

uk /fɑːst/ us /fæst/

fastnoun [ C ]

uk /fɑːst/ us /fæst/

a period of time when you eat no food:

Hundreds of prisoners began a fast in protest about prison conditions.

fastverb [ I ]

uk /fɑːst/ us /fæst/

(Definition of “fast” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“fast” in American English

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fastadjective [ -er/-est only ]

us /fæst/

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

moving or happening quickly or able to move or happen quickly:

a fast car
The fastest way to get there is by plane.

If your watch or clock is fast, it shows a time later than the real time.

fastadjective, adverb [ not gradable ]

us /fæst/

fast adjective, adverb [ not gradable ] (ATTACHED)

connected or attached in a way that is not easily unfastened:

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 sundown tomorrow.
fast
noun [ C ] us /fæst/

They organized a fast to draw attention to the issue of hunger.

fastadverb [ -er/-est only ]

us /fæst/

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

quickly:

The accident was caused by people driving too fast in bad conditions.
This type of wilderness area is disappearing fast.

(Definition of “fast” from the Cambridge Academic Content Dictionary © Cambridge University Press)