Wavenumber in most physical sciences's a wave property inversely related to wavelength, having SI units of reciprocal meters (m−1). Wavenumber's the spatial analog of frequency, that's, it's the measurement of the number of repeating units of a propagating wave (the number of times a wave has the same phase) per unit of space. Application of a Fourier transformation on data as a function of time yields a frequency spectrum; application on data as a function of position yields a wavenumber… (More on Wavenumber)