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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.

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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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10 MFómh 2025 · While many blood tests no longer require fasting in advance, some common ones do. Learn about them, how long you can expect to fast, and how to prepare.

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How fast is your internet? It's important to understand that different internet speeds are necessary for different usage scenarios. Both download and upload speeds determine what's possible. So …