wave·length
(wāvlĕngkth′, -lĕngth′, -lĕnth′)
(wāvlĕngkth′, -lĕngth′, -lĕnth′)n.
Idiom: The distance between one peak of a wave to the next corresponding peak, or between any two adjacent corresponding points, defined as the speed of a wave divided by its frequency.
on the same wavelengthInformal
In complete accord; in harmony:"a fluid ... production in which author, director, designer and cast seem to be working on the same wavelength"(James Lardner).
wavelength