| fifteen | (adjective) being one more than fourteen | Synonyms: 15, xv |
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| (noun) the cardinal number that is the sum of fourteen and one | Synonyms: 15, XV |
| fifteenth | (adjective) coming next after the fourteenth and just before the sixteenth in position | Synonyms: 15th |
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| (noun) position 15 in a countable series of things | - |
| fifth | (adjective) coming next after the fourth and just before the sixth in position | Synonyms: 5th |
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| (noun) the musical interval between one note and another five notes away from it | - |
| (noun) one part in five equal parts | Synonyms: fifth part, one-fifth, twenty percent |
| (noun) a quantity of liquor equal to one fifth of a United States gallon | - |
| (noun) position five in a countable series of things | - |
| fifthly | (adverb) in the fifth place | - |
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| fifties | (noun) the time of life between 50 and 60 | Synonyms: mid-fifties |
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| (noun) the decade from 1950 to 1959 | Synonyms: 1950s |
| fiftieth | (adjective) the ordinal number of fifty in counting order | Synonyms: 50th |
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| (noun) position 50 in a countable series of things | - |
| fifty | (adjective) being ten more than forty | Synonyms: 50, l |
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| (noun) a United States bill worth 50 dollars | Synonyms: fifty dollar bill |
| (noun) the cardinal number that is the product of ten and five | Synonyms: 50, L |