fast - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “fast”

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fast

adjective [-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.

fast

adjective, 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.

fast

verb [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.

fast

adverb [-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)
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