sigma

From Ancient Greek σῖγμα (sîgma), σίγμα (sígma), probably from the root sig- as seen in σίζω (sízō) (< sig-yo "to hiss") + -μα (-ma). [1][2]

• IPA^(key): /ˈsɪɡmə/

• Audio (US)

  (file)

• Rhymes: -ɪɡmə

sigma (plural sigmas or sigmata)

1. The eighteenth letter of the Classical and Modern Greek alphabets, 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. Clipping of sigma male.

• sigma darner (Austroaeschna sigma)
• sigmalike
• within one sigma: the range from the mean, plus or minus one standard deviation, usually covering 68% of the data points in a normal distribution
• sigma male

• Magis., agism, migas

Learned borrowing from Latin sigma.

• (Balearic, Central) IPA^(key): /ˈsiɡ.mə/
• (Valencian) IPA^(key): /ˈsiɡ.ma/

sigma f (plural sigmes)

1. Sigma; the Greek letter Σ (lowercase σ or ς).
2. (anatomy) sigmoid colon

• sigmàtic
• sigmatisme

• sigmoide

• “sigma” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.

sigma n

1. sigma

This noun needs an inflection-table template.

Ultimately form Ancient Greek σῖγμα (sîgma). This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

• IPA^(key): /ˈsɪx.maː/
• Hyphenation: sig‧ma

sigma f (plural sigma's)

1. sigma (letter of the Greek alphabet)

• sigmatisch

< Ancient Greek σίγμα (sígma)

• IPA^(key): /ˈsiɡmɑ/, [ˈs̠iɡmɑ̝]
• Rhymes: -iɡmɑ
• Syllabification^(key): sig‧ma

sigma

1. sigma (Greek letter)

• IPA^(key): /siɡ.ma/

• Audio

  (file)

sigma m (plural sigma)

1. sigma (Greek letter)

• “sigma”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

sigma f (genitive singular sigmu, nominative plural sigmur)

1. sigma (Greek letter)

From Ancient Greek σῖγμα (sîgma), σίγμα (sígma).

• IPA^(key): /ˈsiɡ.ma/
• Rhymes: -iɡma
• Hyphenation: sìg‧ma

sigma m or f (invariable)

1. sigma, specifically:
   1. the name of the Greek-script letter Σ/σ, ς
   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, specifically in a normal distribution

• sigmatismo/sigmacismo

sigma m (invariable)

1. (anatomy) sigmoid colon

• sgami

Borrowed from Ancient Greek σῖγμα (sîgma), from Phoenician 𐤔‬‎ (š‬ /šīn/).

• IPA^(key): /ˈsiɡ.ma/

• Audio

  (file)

• Rhymes: -iɡma
• Syllabification: sig‧ma

sigma f

1. sigma (Greek letter Σ, σ/ς)
2. (mathematics) sigma (symbol Σ, used to indicate summation of a set or series)

• sigma in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
• sigma in Polish dictionaries at PWN

sigma m (plural sigmas)

1. sigma (name of the Greek letter Σ, σ)

From Ancient Greek σῖγμα (sîgma) or French sigma.

sigma m (plural sigma)

1. sigma (Greek letter)

• IPA^(key): /ˈsiɡma/ [ˈsiɣ̞.ma]
• Rhymes: -iɡma
• Syllabification: sig‧ma

sigma f (plural sigmas)

1. sigma; the Greek letter Σ, σ

• “sigma”, in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014