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Noun: constant of proportionality
  1. The constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality
    "In the equation F = ma, the mass m is the constant of proportionality between force and acceleration";
    - factor of proportionality

Derived forms: constants of proportionality

Type of: constant, factor

Encyclopedia: Constant of proportionality