# lambda

> English word · Noun · IPA /ˈlæm.də/ · frequency rank #26,857

## Definitions
1. The eleventh letter of the Classical and Modern Greek alphabet, the twelfth of the Old Greek alphabet.
2. Unit representation of wavelength.
3. The cosmological constant.
4. Ellipsis of lambda baryon.
5. Ellipsis of lambda expression.
6. Ellipsis of lambda function.
7. The junction of the lambdoid and sagittal sutures of the cranium.
8. The percentage change in an option value divided by the percentage change in the underlying asset's price.

## Etymology
From Ancient Greek λάμβδα (lámbda). Doublet of lamed.

## Easily confused with
- **lambs** (https://plainspell.com/en/vs/lambda-vs-lambs)
- **Lambo** (https://plainspell.com/en/vs/lambda-vs-lambo)
- **lamb** (https://plainspell.com/en/vs/lamb-vs-lambda)
- **lama** (https://plainspell.com/en/vs/lama-vs-lambda)
- **labia** (https://plainspell.com/en/vs/labia-vs-lambda)

## Common misspellings (9)
`almbda`, `labmda`, `lambad`, `lambbda`, `lambdda`, `lamdba`, `lammbda`, `llambda`, `lmabda`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/lambda