1) N-COUNT: usu with supp A wavelength is the distance between a part of a wave of energy such as light or sound and the next similar part.

Sunlight consists of different wavelengths of radiation...

Blue light has a shorter wavelength than red.

2) N-COUNT: with supp A wavelength is the size of radio wave which a particular radio station uses to broadcast its programmes.

She found the wavelength of their broadcasts, and left the radio tuned to their station.

3) PHRASE: v-link PHR If two people are on the same wavelength, they find it easy to understand each other and they tend to agree, because they share similar interests or opinions.

We could complete each other's sentences because we were on the same wavelength.

English dictionary. 2008.

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