sigma

FREQ #21712

[计] 求和 [医] σ(希腊文第十八个字母)

发音

US /ˈsɪɡmə/

词形变化

sigmas 复数 sigmas sigmata sigmata 复数 more sigma 比较级 most sigma 最高级

释义与例句

n.
  1. 1.

    The eighteenth letter of the Classical and Modern Greek alphabets (Σ, σ), the twentieth letter of Old and Ancient.

    西格玛

    西格马

  2. 2.

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

    数学
  3. 3.

    The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.

    数学

    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. 4.

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

adj.
  1. 1.

    Possessing characteristics of a sigma male.

词汇关系

名词

上位词 1

letter

整体词 1

Greek alphabet

相关短语

sigma bond [化] σ键 sigma additivity sigma bonds sigma male sigma males σ-additivity lunate sigma final sigma Six Sigma the sigma within one sigma

词源

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

来源：wiktionary