wavelengths

/W EY1 V L EH0 NG TH S/
noun
  1. 1

    The length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next; it is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

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Source: https://en.wiktionary.org/wiki/wavelength, https://en.wiktionary.org/wiki/wavelengths