noun
also fourier transformation ˈfu̇rēˌā-, fu̇rˈyā-
Usage: usually capitalized F
Etymology: after Baron Jean Baptiste Joseph Fourier died 1830 French geometrician and physicist
: any of various functions (as F ( u )) that under suitable conditions can be obtained from given functions (as f ( x )) by multiplying by e iux and integrating over all values of x and that are widely used in analyzing data especially by computer-driven scientific instrumentation