wavelength

noun

wave·​length ˈwāv-ˌleŋ(k)th 

1

: the distance in the line of advance of a wave from any one point to the next point of corresponding phase

2

: a particular course or line of thought especially as related to mutual understanding

two people on different wavelengths

Examples of wavelength in a Sentence

Light and sound have different wavelengths.

Recent Examples on the Web

Next, the researchers studied it using the X-shooter spectrograph on the Very Large Telescope, which can capture different wavelengths of light emitted by an object ranging from ultraviolet to near-infrared. —Ashley Strickland, CNN Money, 2 Oct. 2025

Blue light targets acne-causing bacteria to help keep breakouts at bay, while red and near-infrared wavelengths penetrate deeper to stimulate collagen, improve circulation, and promote skin repair. —Conçetta Ciarlo, Vogue, 1 Oct. 2025

First, get yourself on the same wavelength. —Jonny Thomson, Big Think, 1 Oct. 2025

Showrunner Matheny was on a similar wavelength when describing his thoughts about taking on the project. —Devonne Goode, Parents, 1 Oct. 2025

Word History

First Known Use

1850, in the meaning defined at sense 1

Kids Definition

wavelength

noun

wave·​length ˈwāv-ˌleŋ(k)th 

1

: the distance (as from crest to crest) in the line of advance of a wave from any one point to the next corresponding point

2

: a certain line of thought or behavior that reveals a common understanding

coworkers who are on the same wavelength

Medical Definition

wavelength

noun

wave·​length -ˌleŋ(k)th 

: the distance in the line of advance of a wave from any one point to the next point of corresponding phase

—symbol λ