| four | (noun) a playing card or domino or die whose upward face shows four pips | Synonyms: four-spot |
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| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| fourpence | (noun) a former English silver coin worth four pennies | Synonyms: groat |
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| fourscore | (noun) the cardinal number that is the product of ten and eight | Synonyms: 80, eighty, LXXX |
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| foursome | (noun) four people considered as a unit | Synonyms: quartet, quartette |
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| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| foursquare | (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: square |
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| fourteen | (noun) the cardinal number that is the sum of thirteen and one | Synonyms: 14, XIV |
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| fourteenth | (noun) position 14 in a countable series of things | - |
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| fourth | (noun) the musical interval between one note and another four notes away from it | - |
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| (noun) one of four equal parts | Synonyms: fourth part, one-fourth, one-quarter, quarter, quartern, twenty-five percent |
| (noun) following the third position; number four in a countable series | - |