English Dictionary

sigma

IPA（発音記号）

/ˈsɪɡmə/

名詞

The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient. / (mathematics) The symbol Σ, used to indicate summation of a set or series.

日本語の意味

古典および現代ギリシャ語におけるアルファベットの一文字（クラシックでは18番目、場合により古代では20番目） / 数学で使用される記号Σ。集合や数列の総和を示すために使われる

The linguistics professor pointed out that the sigma in the ancient manuscript was written in its archaic form.

言語学の教授は、その古い写本の中の、古典・現代ギリシャ文字では18番目（古代や旧時代の表記では20番目）の文字が古風な形で書かれていることを指摘した。

意味（1）

The eighteenth letter of the Classical and Modern Greek alphabets, 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.

意味（2）

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

意味（3）

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

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.

sigmas （ plural ）

sigmata （ plural ）