American Heritage® Dictionary of the English Language, Fourth Edition
- n. The 18th letter of the Greek alphabet. See Table at alphabet.
- n. A sigma factor.
- n. A sigma baryon.
Century Dictionary and Cyclopedia
- n. The name of the Greek letter
Σ, σ, ς, equivalent to the English S, s. (For its early forms, see under S.) There is also an uncial form (see uncial), namely C, made from Σby curving and slighting; this has been revived in some recent alphabets of Greek.
- n. An S-shaped or sigmoid flesh-spicule of a sponge.
- n. The curve of the letter S or any approximate curve.
- n. In descriptive biol., one of the S-shaped ridges on the surface of certain molluscan shells, as those of gastropods and cephalopods.
- n. In experimental psychology, the time-unit, of a second: abbreviated
- n. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
- n. mathematics The symbol Σ, used to indicate summation of a set or series.
- n. statistics The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
GNU Webster's 1913
- n. the 18th letter of the Greek alphabet
- Greek sīgma, of Phoenician origin; see smk in Semitic roots. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Three sigma" is a manufacturing concept used to control processes, a concept that I am intimately familiar with.”
“The standard of comparison, 125 [sigma], is shorter than most of the reaction times recorded, but since the time measured was always that from the breaking to the making of the circuit passing through the chronoscope it cannot be urged that there were errors resulting from the difference of magnetization which was caused by variations in the reaction time.”
“I called sigma support line and they gave mixed opinions.”
“He was as honorably decorated as any of the American Joint Chief’s of Staff; even wearing his gold colored in sigma upon his green military cap.”
“This significance is 3.8 sigma, which is comparable to the UTfit difference, although in a totally different process.”
“Also, I believe Toyota is six sigma, which is less than 3.4 errors/1 million chances or 00. 00034%, so they would tear their arms out if they were at 00.04%. —”
“Summers quoted at Marginal Revolution rationalized by talking about the gender ratios at 3.5-4 sigma, which is above the 99.9th percentile.”
“Usually we demand five sigma, that is five standard deviations from the peak, to claim “discovery.””
“Often, that level of probability is arbitrarily set to a value like 95%, or two standard deviations, two sigma, which is about 98% for a normal distribution.”
“I mean, the highest rated PS3 game thusfar is ninja gaiden sigma, which is simply another remake of the origional from the xbox a spiffy remake, but a remake nonetheless.”
These user-created lists contain the word ‘sigma’.
A collection of words found in English that are either purely Greek or have Greek etymology.
Please add with caution and certainty. Will be regularly updated by me.
A marque list for cars--models or companies who've used common words as their name.
A list of the richly esoteric and myriad terms that have been used in the classification and study of fossil and modern sponge spicules.
The morphology of sponge spicule elements paral...
See also The Phonetic alphabet by oroboros.
It Makes The Words, or It gets The Hose. Again.
The letters in the Greek alphabet, with a bit of history on each one.
Miscellaneous words that deserve some kind of recognition.
I might just be tired, but it sounds like the cry of some bandersnatch
Looking for tweets for sigma.