Definition of Fourier transform
: any of various functions (as F(u)) that under suitable conditions can be obtained from given functions (as f(x)) by multiplying by eiux 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) especially of a very small magnitude —called also Fourier transformation
First Known Use of fourier transform
Learn More about fourier transform
Britannica.com: Encyclopedia article about Fourier transform
Seen and Heard
What made you want to look up Fourier transform? Please tell us where you read or heard it (including the quote, if possible).