Definition of sigma Sigma

/sɪˈgmʌ/ - [sigmu] - sig•ma

We found 8 definitions of sigma from 6 different sources.

What does sigma mean?

WordNet

Noun

Plural: sigmas

sigma - the 18th letter of the Greek alphabet

alphabetic character, letter of the alphabet, letter a written message addressed to a person or organization; "mailed an indignant letter to the editor"

= synonym
= antonym
= related word

Wiktionary

sigma (Noun)
The name for the eighteenth letter of the Classical Classical and Modern Greek , the nineteenth letter of Old Old and Ancient Ancient .
sigma (Noun)
The symbol Σ, used to indicate summation of a set or series.
sigma (Noun)
The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution .

Webster DictionaryWebster's Unabridged Dictionary 📘

sigma (n.)
The Greek letter /, /, or / (English S, or s). It originally had the form of the English C.

Chambers DictionaryChamber's 20th Century Dictionary 📕

sigma
sig′ma, n. the Greek letter corresponding to our s—written Σ (capital), σ (small initial) or ς (small final).—adjs. Sig′mate, Sigmat′ic.—ns. Sigmā′tion, the adding of s at the end of a word or syllable; Sig′matism, repetition of s or the s-sound: defective pronunciation of this sound.—adjs. Sig′moid, -al, formed like s

Wikipedia

letter
Sigma (uppercase/lowercase Σ σ ς), is the letter of the Greek alphabet, used to represent the "s" sound in Ancient and Modern Greece. In the system of Greek numerals, it has a value of 200. Letters that came from it include the Roman S and Cyrillic С.

Part of speech

🔤

sigma, noun, singular of sigmas.

Pronunciation

Word frequency

Sigma is...

Very rare

Rare

Normal

Common

Very Common