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Wavelength is a property of waves. It is the distance from wave crest to wave crest. Or from trough to trough—same distance. Wavelength is symbolized by the ancient Greek letter 𝛌, called “lambda.”


wavelength, amplitude, crest, trough
Wave properties. Wavelength is the distance from trough to trough or crest to crest. [Image source: Kraaiennest – CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4038226. Retrieved Sept. 21, 2017.]
For considerably more information, see the entry for frequency and wavelength.