| NOUN | quantity | factor of proportionality, constant of proportionality | the constant value of the ratio of two proportional quantities x and y |
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| Meaning | The constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality. | |
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| Synonym | constant of proportionality | |
| Narrower | Planck's constant, h | The constant of proportionality relating the energy of a photon to its frequency |
| Broader | constant | A number representing a quantity assumed to have a fixed value in a specified mathematical context |
| factor | Any of the numbers (or symbols) that form a product when multiplied together | |
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