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Wiktionary
linear function

n. 1 (context mathematics English) Any function whose graph is a straight line 2 (context mathematics English) Any function whose value on the sum of two elements is the sum of the values of the function on the two elements and whose value on the product of a scalar times an element is the scalar times the value of the function on the element.

Wikipedia
Linear function

In mathematics, the term linear function refers to two distinct but related notions:

Linear function (calculus)

In calculus and related areas of mathematics, a linear function from the real numbers to the real numbers is a function whose graph (in Cartesian coordinates with uniform scales) is a line in the plane. Their characteristic property that when the value of the input variable is changed, the change in the output is a constant multiple of the change in the input variable.

Linear functions are related to linear equations.

Usage examples of "linear function".

Deleuze (following Bergson) and Morse Peckham (following the American pragmatists) both suggest that subjectivity is located in the gap between stimulus and response: it is the indeterminacy, the space of randomization, the temporal delay in the sensorimotor apparatus by virtue of which the latter is no longer a linear function and predictable consequence of the former.

After that, with the loss of the coolant, the virus particles would start to die in a linear function.

Rank, from the operators at planetary-population levels up to and including the Eddorian Directorate, will be a linear function of ability.

They kept coming earlier by a period indicating a linear function until one week ago.