| fast | (noun) abstaining from food | Synonyms: fasting |
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| fastball | (noun) (baseball) a pitch thrown with maximum velocity | Synonyms: bullet, heater, hummer, smoke |
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| fastener | (noun) restraint that attaches to something or holds something in place | Synonyms: fastening, fixing, holdfast |
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| (noun) a person who fastens or makes fast | - |
| fastening | (noun) the act of fastening things together | Synonyms: attachment |
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| (noun) restraint that attaches to something or holds something in place | Synonyms: fastener, fixing, holdfast |
| fastidiousness | (noun) the trait of being meticulous about matters of taste or style | - |
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| fasting | (noun) abstaining from food | Synonyms: fast |
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| fastnacht | (noun) doughnut traditionally eaten on Shrove Tuesday | - |
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| fastness | (noun) a strongly fortified defensive structure | Synonyms: stronghold |
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| (noun) a rate (usually rapid) at which something happens | Synonyms: speed, swiftness |
| (noun) the quality of being fixed in place as by some firm attachment | Synonyms: fixedness, fixity, fixture, secureness |