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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.

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

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