sigma

[ sig-muh ]

noun

1. the 18th letter of the Greek alphabet: Σ, σ, ς.
2. the consonant sound represented by this letter.

sigma

/ ˈsɪɡmə /

noun

1. the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
2. maths the symbol Σ, indicating summation of the numbers or quantities indicated

sigma

/ sĭg′mə /

1. A sigma baryon.

Word History and Origins

Origin of sigma¹

First recorded in 1600–10; from Latin, from Greek sígma

Word History and Origins

Origin of sigma¹

Greek, of Semitic origin; related to Hebrew samekh

Example Sentences

The drugs either targeted the sigma receptors or they stopped the virus from growing.

From Science News

SigMa members held demonstrations at MAL’s host hotel and always saw a bump in attendance from visitors in town for the event.

From Washington Blade

Lohse rushes Sigma Alpha Epsilon, gets a bid, endures pledge term, and then submits to the dehumanizing rigors of Hell Night.

From The Daily Beast

Pledging, also known as initiation, will now be abolished by Sigma Alpha Epsilon nationally across its 240 chapters.

From The Daily Beast

For example, what business has the letter rho in the word katoptron, or the letter sigma in the word sphigx?

From Project Gutenberg

All of them wore, in addition to their temple knives, holstered sigma-ray needlers.

From Project Gutenberg

He drew his hand from under the left side of the senseless man's robe and held up a sigma-ray needler.

From Project Gutenberg

Sigma, sig′ma, n. the Greek letter corresponding to our s—written Σ (capital), σ (small initial) or ς (small final).

From Project Gutenberg

It is to be observed that the Grecians in foreign words continually omitted the Nu final, and substituted a Sigma.

From Project Gutenberg