is: the process of using values of a dependent variable, measured over a finite range of the corresponding independent variable(s), to estimate the value of the dependent variable corresponding to a value of the independent variable(s) that falls outside the measured range. [P1.3]
is exemplified: by the extension of a graph beyond the range of values within which measurements have been made. [P1.3]
Contrast with interpolation.
Copyright 1997, The Open University