sigma
the 18th letter of the Greek alphabet: Σ, σ, ς.
the consonant sound represented by this letter.
Origin of sigma
1Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use sigma in a sentence
The little pair southeast of Aldebaran, called the Sigmas, is also a beautiful object.
Astronomy with an Opera-glass | Garrett Putman ServissThe latter, seeing the Sigmas on the shields and taking them to be "Sicyonians," had not the slightest fear.
Hellenica | Xenophon
British Dictionary definitions for sigma
/ (ˈsɪɡmə) /
the 18th letter in the Greek alphabet (Σ, σ, or, when final, ς), a consonant, transliterated as S
maths the symbol Σ, indicating summation of the numbers or quantities indicated
Origin of sigma
1Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for sigma
[ sĭg′mə ]
A sigma baryon.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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