noun Date: 1850 the distance in the line of advance of a wave from any one point to the next point of corresponding phase, a particular course or line of thought especially as related to mutual understanding
WAVELENGTH
Meaning of WAVELENGTH in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012