sigma [sig-muh] ExamplesWord Origin noun

  1. the 18th letter of the Greek alphabet: Σ, σ, ς.
  2. the consonant sound represented by this letter.

Origin of sigma 1600–10; Latin Greek sígma Examples from the Web for sigma Contemporary Examples of sigma

  • Lohse rushes Sigma Alpha Epsilon, gets a bid, endures pledge term, and then submits to the dehumanizing rigors of Hell Night.

    An Ivy League Frat Boy’s Shallow Repentance

    Stefan Beck

    November 24, 2014

  • Pledging, also known as initiation, will now be abolished by Sigma Alpha Epsilon nationally across its 240 chapters.

    Deadly Frat Rituals Are Banned Thanks to Technology

    Joe Concha

    March 10, 2014

  • Historical Examples of sigma

  • And all of these records were summed up, integrated, into the “Sigma” curve.

    The Vortex Blaster

    Edward Elmer Smith

  • Sigma is thanked: but he will see that we could not now alter the size of our volumes.

    Notes and Queries, Number 169, January 22, 1853


  • Sigmoid, curved in two directions, like the letter S, or the Greek sigma.

    The Elements of Botany

    Asa Gray

  • Take colour, for instance; and we shall perceive that in the Dromius sigma, Rossi, it is sensibly affected.

    On the Variation of Species, with Especial Reference to the Insecta ; Followed by an Inquiry into the Nature of Genera

    Thomas Vernon Wollaston

  • There he began to find himself, and became one of the popular men in his class and in the Sigma Phi Fraternity.

    Frank H. Nelson of Cincinnati

    Warren C. Herrick

  • British Dictionary definitions for sigma sigma noun

    1. the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
    2. maths the symbol Σ, indicating summation of the numbers or quantities indicated

    Word Origin for sigma Greek, of Semitic origin; related to Hebrew samekh Word Origin and History for sigma

    18th letter of the Greek alphabet, corresponding to Latin S, a metathesis of Hebrew samekh. In uncial writing, shaped like an S or a C.

    sigma in Medicine sigma [sĭg′mə] n.

    1. The 18th letter of the Greek alphabet.

    sigma in Science sigma [sĭg′mə]

    1. A sigma baryon.

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