If two variables are directly proportional to one another then the constant of proportionality is the ratio of their values. If they are in inverse proportion then the constant of proportionality is the product of their values.
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The answer depends on what the constant is: the y-intercept in a linear graph, constant of proportionality, constant of integration, physical [universal] constant.
Constant is a number with no variables. For an example, 12a, but this is a constant 12.
It is an arithmetic sequence (with constant difference 0), or a geometric sequence (with constant ratio 1).
A value that does not change is a constant.
It may be called "the constant term".