FAST definition: moving or able to move, operate, function, or take effect quickly; quick; swift; rapid: a fast pain reliever; See examples of fast used in a sentence.

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Grammar Fast, quick or quickly? Fast and quick mean moving with great speed. Fast is both an adjective and an adverb. Quick is an adjective and the adverb form is quickly. …

Some common synonyms of fast are expeditious, fleet, hasty, quick, rapid, speedy, and swift. While all these words mean "moving, proceeding, or acting with celerity," fast and rapid are …

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If you fast, you eat no food for a period of time, usually for either religious or medical reasons, or as a protest. I fasted for a day and a half and asked God to help me. Fast is also a noun. The …

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FAST meaning: 1 : moving or able to move quickly; 2 : happening quickly taking a short amount of time