wavelength

wave + length

• (UK) IPA ^(key): /ˈweɪvlɛŋ(k)θ/
• (US) IPA ^(key): /ˈweɪvˌlɛŋ(k)θ/

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1. (countable) The physical length of a wave, especially an electromagnetic wave. For electromagnetic waves, the wavelength is approximately the speed of light divided by frequency.