| four | (adjective) being one more than three | Synonyms: 4, iv |
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| (noun) a playing card or domino or die whose upward face shows four pips | Synonyms: four-spot |
| (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 |
| fourfold | (adjective) having four units or components | Synonyms: four-fold, quadruple, quadruplex, quadruplicate |
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| (adjective) four times as great or many | Synonyms: four-fold, quadruple |
| (adverb) by a factor of four | Synonyms: four times |
| fourhanded | (adjective) (of card games) involving or requiring four players | - |
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| fourpence | (noun) a former English silver coin worth four pennies | Synonyms: groat |
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| fourpenny | (adjective) used of nail size; 1 1/2 in or 3.8 cm long | - |
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| fourscore | (adjective) being ten more than seventy | Synonyms: 80, eighty, lxxx |
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| (noun) the cardinal number that is the product of ten and eight | Synonyms: 80, eighty, LXXX |
| 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 | (adjective) characterized by firm and unwavering conviction | - |
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| (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: square |
| (adverb) with firmness and conviction; without compromise | Synonyms: squarely, straightforwardly |
| (adverb) in a square position | - |
| fourteen | (adjective) being one more than thirteen | Synonyms: 14, xiv |
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| (noun) the cardinal number that is the sum of thirteen and one | Synonyms: 14, XIV |
| fourteenth | (adjective) coming next after the thirteenth in position | Synonyms: 14th |
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| (noun) position 14 in a countable series of things | - |
| fourth | (adjective) coming next after the third and just before the fifth in position or time or degree or magnitude | Synonyms: 4th, quaternary |
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| (noun) the musical interval between one note and another four notes away from it | - |
| (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 | - |
| (adverb) in the fourth place | Synonyms: fourthly |
| fourthly | (adverb) in the fourth place | Synonyms: fourth |
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