Etymology
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wavelength (n.)
also wave-length, 1850, "distance between peaks of a wave," from wave (n.) + length. Originally of spectra; radio sense is attested by 1925. Figurative sense of "mental harmony" is recorded from 1927, on analogy of radio waves.
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short-wave (adj.)
in reference to radio wavelength less than c.100 meters, 1907, from short (adj.) + wave (n.).
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monochromatic (adj.)

"of one color, consisting of light of one wavelength," 1807, from mono- + chromatic, or from monochrome. Perhaps based on French monochromatique or Greek monokhrōmatos "of one color." Related: Monochromatically (1784).

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