wavelength

n. length of a wave (Physics, Electronics)

In physics, wavelength is the distance between repeating units of a propagating wave of a given frequency. It is commonly designated by the Greek letter lambda (λ). Examples of wave-like phenonomena are light, water waves, and sound waves. In a wave, a property varies with the position. For example, this property can be the air pressure for a sound wave, or the magnitude of the electric or the magnetic field for light. The wavelengths of frequencies audible to the human ear (20 Hz–20 kHz) are between approximately 17 m and 17 mm, respectively. Visible light ranges from deep red, roughly 700 nm to violet, roughly 400 nm (430–750 THz). For other examples, see  electromagnetic spectrum.
See more at Wikipedia.org...

Noun
1. the distance (measured in the direction of propagation) between two points in the same phase in consecutive cycles of a wave
(hypernym) distance
2. a shared orientation leading to mutual understanding; "they are on the same wavelength"
(hypernym) orientation

The distance between points of corresponding phase of two consecutive cycles of a wave. (188 ) Note: The wavelength, , is related to the propagation velocity, v , and the frequency, f , by = v /f .

the length of one complete cycle of a wave. In semiconductors, wavelength is typically applied to light.