FOURIER TRANSFORM

[Fourier transform] n (1923): any of various functions (as F(u)) that under suitable conditions can be obtained from given functions (as f(x)) by multiplying by the transcendental number e to the exponent iux and integrating over all values of x and that in scientific instrumentation describe the dependence of the average of a series of measurements (as of a spectrum) on a quantity of interest (as brightness) esp. of a very small magnitude--called also Fourier transformation