sigma

名词 n. 形容词 adj.
中文释义

英文释义

名词 n.
  1. The eighteenth letter of the Classical and Modern Greek alphabets (Σ, σ), the twentieth letter of Old and Ancient.
    — 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. The symbol Σ, used to indicate summation of a set or series.
  3. 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. A sigma male (a self-reliant and assertive male). Internet
形容词 adj.
  1. Possessing characteristics of a sigma male. Internet

词形变化

sigmas plural sigmata plural more sigma comparative most sigma superlative

词汇关系

衍生词
delta-sigma converter final sigma lunate sigma sigma additivity sigma-algebra sigma bond sigma darner sigma-delta converter sigmalike sigma male sigmate sigmatic sigmatism sigmavirus sigmoid Six Sigma the sigma within one sigma

词源

词源 1
From Ancient Greek σῖγμα (sîgma), probably from the root σῑγ- (sīg-) as seen in σίζω (sízō, “to hiss”) + -μα (-ma, nominal suffix).
词源 2
From Ancient Greek σῖγμα (sîgma), probably from the root σῑγ- (sīg-) as seen in σίζω (sízō, “to hiss”) + -μα (-ma, nominal suffix).
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