Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “fast”

fast

adjective [-er/-est only]  /fæst/ us  

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]  /fæst/ us  

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]  /fæst/ us  

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]  /fæst/ us  
They organized a fast to draw attention to the issue of hunger.

fast

adverb [-er/-est only]  /fæst/ us  

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)
What is the pronunciation of fast?
Browse related topics

You are looking at an entry to do with Treating as unimportant, but you might be interested in these topics from the Attention and care topic area:

Add Cambridge dictionaries to your browser to your website

Definitions of “fast” in other dictionaries

Word of the Day

yo

used as an informal greeting between people who know each other or as an expression of approval

Word of the Day

Come on – you can do it! Phrasal verbs with ‘come’.

by Liz Walter​,
November 19, 2014
As part of an occasional series on the tricky subject of phrasal verbs, this blog looks at ones formed with the verb ‘come’. If you are reading this blog, I’m sure you already know come from, as it is one of the first things you learn in class: I come from Scotland/Spain.

Read More 

silver splicer noun

November 17, 2014
informal a person who marries in later life Newly retired and now newlywed – rise of the ‘silver splicers’ Reaching pension age becomes a trigger to tie the knot as baby-boomers begin to redefine retirement

Read More