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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fast, rapid, swift, fleet, quick, speedy, hasty, expeditious mean moving, proceeding, or acting with celerity. fast and rapid are very close in meaning, but fast applies particularly to the thing that moves

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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. …

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You use fast to say that something happens without any delay. When you've got a crisis like this you need professional help–fast! We'd appreciate your leaving as fast as possible. Fast is also an adjective.

May 18, 2016 · Today we are launching fast.com, a simple-to-use website to help you see how fast your Internet connection is, whether on mobile or broadband, anywhere in the world. And like the Netflix …

FAST definition: 1. moving, happening, or doing something quickly: 2. If a clock or watch is fast, it shows a time…. Learn more.