Definition of SIGMA

sigma

Meanings

Plural: sigmas, sigmata

Noun

  • the 18th letter of the Greek alphabet
  • The eighteenth letter of the Classical and Modern Greek alphabets (Σ, σ), the twentieth letter of Old and Ancient.
  • The symbol Σ, used to indicate summation of a set or series.
  • The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.
  • A sigma male (a self-reliant and assertive male).

Origin / Etymology

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

Scrabble Score: 8

sigma is a valid Scrabble (US) TWL word
sigma is a valid Scrabble Word in Merriam-Webster MW Dictionary
sigma is a valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 10

sigma is a valid Words With Friends word