Sigma Definition

sĭgmə
noun
The eighteenth letter of the Greek alphabet (Σ, σ, ς)
Webster's New World
A sigma factor.
American Heritage Medicine
The standard deviation of a given probability distribution or a given set of data.
American Heritage

(mathematics) The symbol Σ, used to indicate summation of a set or series.

Wiktionary

Other Word Forms of Sigma

Noun

Singular:
sigma
Plural:
sigmas

Origin of Sigma

  • Greek sīgma of Phoenician origin smk in Semitic roots

    From American Heritage Dictionary of the English Language, 5th Edition

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