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wavenumber
wave number
;
reciprocal of the wavelength
Note 1 to entry: The wavenumber is expressed in metre to the power minus one (m−1).
Note 2 to entry: This entry was numbered 845-01-15 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1425 in CIE S 017:2011.