# Fourier transform

## noun

**:**any of various functions (such as

*F(u)*) that under suitable conditions can be obtained from given functions (such as

*f(x)*) by multiplying by

*e*and integrating over all values of

^{iux}*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 (such as brightness) especially of a very small magnitude

called also Fourier transformation

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Merriam-Webster unabridged
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