fast
adverb
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quickly or rapidly, which is often used as a combining form“How fast can they get here?”
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firmly or closely“held fast to the rope”tight
adjective
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(of a photographic lens or emulsion) causing a shortening of exposure time“a fast lens”
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acting or moving or capable of acting or moving quickly“fast film”
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at a rapid tempo“the band played a fast fox trot”
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indicating a time ahead of or later than the correct time“My watch is always fast.”
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securely fixed in placefirm
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hurried and briefquickflying
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unrestrained by convention or moralityriotousdegradeddissipateddebaucheddegeneratedissolutelibertineprofligate
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resistant to destruction or fading“fast colors”
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(of surfaces) conducive to rapid speeds“a fast road”
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unwavering in devotion to friend or vow or causefirm
noun
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abstaining from foodfasting
verb
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abstain from eating“Before the medical exam, you must fast”
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abstain from certain foods, as for religious or medical reasons“Catholics sometimes fast during Lent”