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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. The 18th letter of the Greek alphabet. See Table at alphabet.
  2. n. A sigma factor.
  3. n. A sigma baryon.

Century Dictionary and Cyclopedia

  1. 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 Σ by curving and slighting; this has been revived in some recent alphabets of Greek.
  2. n. An S-shaped or sigmoid flesh-spicule of a sponge.
  3. n. The curve of the letter S or any approximate curve.
  4. n. In descriptive biol., one of the S-shaped ridges on the surface of certain molluscan shells, as those of gastropods and cephalopods.
  5. n. In experimental psychology, the time-unit, of a second: abbreviated σ.

Wiktionary

  1. n. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
  2. n. mathematics The symbol Σ, used to indicate summation of a set or series.
  3. n. statistics The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.

GNU Webster's 1913

  1. n. The Greek letter Σ, σ, or ς (English S, or s). It originally had the form of English C.

WordNet 3.0

  1. n. the 18th letter of the Greek alphabet

Etymologies

  1. Greek sīgma, of Phoenician origin; see smk in Semitic roots. (American Heritage® Dictionary of the English Language, Fourth Edition)

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‘sigma’ has been looked up 1492 times, added to 15 lists, commented on 1 time, and has a Scrabble score of 8.