# wavelength

/ˈweɪvˌɫɛŋθ/ (US) · /wˈeɪvlɛŋθ/ (UK)

Source: https://englishreference.com/word/wavelength
Updated: 2026-08-08

## Senses

### 1. physics/science

noun · CEFR B2 · Technical

the distance between two peaks of a wave, like light or sound.

For teachers: the distance between successive crests or troughs of a wave, particularly of electromagnetic radiation or sound.

- Different colours of light have different wavelengths.
- The telescope is designed to detect infrared radiation at a specific wavelength that is normally invisible to the human eye.

Usage: Often used with the preposition 'at'.

### 2. understanding each other

noun · CEFR B2 · Informal

a way of thinking or a set of ideas that you share with someone else.

For teachers: a state of agreement or mutual understanding regarding ideas, feelings, or philosophy.

- We work well together because we are on the same wavelength.
- It was refreshing to meet a business partner who was on the same wavelength regarding the long-term sustainability of the project.

Usage: Almost always used in the phrase 'on the same wavelength'.

## Examples

- Red light has a longer wavelength than blue light.
- We tried working together on the new design, but we just weren't on the same wavelength.
- The new telescope captures images at infrared wavelengths, allowing astronomers to peer through dense cosmic dust clouds that obscure visible light.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.