英和和英

語源

From Ancient Greek σῖγμα (sîgma), probably from the root σῑγ- (sīg-) as seen in σίζω (sízō, “to hiss”) + -μα (-ma, nominal suffix).

発音

• IPA: /ˈsɪɡmə/
• 韻: -ɪɡmə

名詞

sigma (plural sigmas or sigmata)

1. The eighteenth letter of the Classical and Modern Greek alphabets (Σ,  σ), the twentieth letter of Old and Ancient.
   • "Herodotus: On The Customs of the Persians", I.139:

     Their names, which are expressive of some bodily or mental excellence, all end with the same letter---the letter which is called San by the Dorians, and Sigma by the Ionians.

2. (mathematics) The symbol Σ, used to indicate summation of a set or series.
3. (statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
   • 2011, Paul Rincon, (bbc.co.uk) LHC: Higgs boson 'may have been glimpsed'

     None of the spikes seen by the experiments is at much more than the "two sigma" level of certainty.
     A level of "five sigma" is required to claim a discovery, meaning there is less than a one in a million chance the data spike is down to a statistical fluke.

4. (Internet slang) A sigma male (a self-reliant and assertive male).

派生語

参考

• (Greek-script letter names) alpha, beta, gamma, delta, epsilon, zeta, eta, theta, iota, kappa, lambda, mu, nu, xi, omicron, pi, rho, sigma, tau, upsilon, phi, chi, psi, omega

形容詞

sigma (comparative more sigma, superlative most sigma)

1. (Internet slang) Possessing characteristics of a sigma male.

参照

アナグラム

• Magis., agism, migas