lambda

/ˈlæm.də/

//ˈlæm.də// noun

By · According to Wiktionary data (CC BY-SA) ·

"lambda" is a 6-letter English headword indexed on PlainSpell.

The verdict

“lambda” is a moderately-common English word, ranked #26,857 in English word frequency and used as a noun.

#26,857
frequency rank, English
6
letters
9
tracked misspellings
5
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The eleventh letter of the Classical and Modern Greek alphabet, the twelfth of the Old Greek alphabet.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

lambda vs lambs
67% similar
lambda vs Lambo
50% similar
lambda vs lamb
67% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for lambda
PropertyValue
Headwordlambda
LanguageEnglish
Part of speechNoun
IPA/ˈlæm.də/
Letters6
Frequency rank#26,857
Misspellings tracked9
Confusable pairs5
SourceWiktionary (kaikki.org)

Where “lambda” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). lambda lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for lambda is 6 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈlæm.də/. Corpus data places it at rank #26,857 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 9 likely wrong-spelling variants for lambda, with forms such as "almbda", "labmda", and "lambad". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 5 confusable-pair relationships, "lambs", "Lambo", "lamb", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Ancient Greek λάμβδα (lámbda). Doublet of lamed. The correct English form is lambda, spelled L-A-M-B-D-A.

Definition

  1. 1
    The eleventh letter of the Classical and Modern Greek alphabet, the twelfth of the Old Greek alphabet.
  2. 2
    Unit representation of wavelength.
  3. 3
    The cosmological constant.
  4. 4
    Ellipsis of lambda baryon.
  5. 5
    Ellipsis of lambda expression.
  6. 6
    Ellipsis of lambda function.
  7. 7
    The junction of the lambdoid and sagittal sutures of the cranium.
  8. 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.

Synonyms

elasticityomega

This word in other languages

lambda(Español)lambda(Français)Lambda(Deutsch)

Common misspellings

Also misspelled as: almbda,labmda,lambad,lambbda,lambdda,lamdba,lammbda,llambda,lmabda

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of lambda - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

almbda2labmda2lambad2lambbda1lambdda1lamdba2lammbda1llambda1
Edit distance from "lambda"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "lambda"?
"lambda" is spelled L-A-M-B-D-A. The IPA pronunciation is /ˈlæm.də/.
What does "lambda" mean?
As a noun, "lambda" means: The eleventh letter of the Classical and Modern Greek alphabet, the twelfth of the Old Greek alphabet.
What words are commonly confused with "lambda"?
"lambda" is commonly confused with "lambs", "Lambo", "lamb". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "lambda"?
The IPA (International Phonetic Alphabet) transcription for "lambda" is /ˈlæm.də/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "lambda"?
From Ancient Greek λάμβδα (lámbda). Doublet of lamed. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “lambda”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is L-A-M-B-D-A - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈlæm.də/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “lambs” - see the side-by-side comparison. lambda vs lambs
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list