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Definition of fast
fast - adj. acting or moving or capable of acting or moving quickly; at a rapid tempo; (used of timepieces) indicating a time ahead of or later than the correct time; securely fixed in place; resistant to destruction or fading; (of surfaces) conducive to rapid speeds; unwavering in devotion to friend or vow or cause; hurried and brief; unrestrained by convention or morality; firmly fastened or secured against opening; adv. quickly or rapidly (often used as a combining form); firmly or tightly; noun abstaining from food; verb abstain from eating; abstain from certain foods, as for religious or medical reasons.
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