تعريف harmonic analysis في الإنجليزية الإنجليزية القاموس.
A study of the representation of functions or signals as the superposition of basic waves, involving the notions of harmonic functions, trigonometric series, Fourier series, Fourier transforms, almost periodic functions, and others
The study of functions given by a Fourier series or analogous representations, such as periodic functions and functions on topological groups
advanced development of "classical" harmonic analysis dealing with functions of general kinds and with arguments as representations of infinite groups and group algebras of locally compact groups