sigma
[ sig-muh ]
/ ˈsɪg mə /
noun
the 18th letter of the Greek alphabet: Σ, σ, ς.
the consonant sound represented by this letter.
QUIZZES
LEARN THE SPANISH WORDS FOR THESE COMMON ANIMALS!
Are you learning Spanish? Or do you just have an interest in foreign languages? Either way, this quiz on Spanish words for animals is for you.
Question 1 of 13
How do you say “cat” 🐈 in Spanish?
Origin of sigma
1600–10; <Latin <Greek sígma
Words nearby sigma
SIGINT, Sigismund, Sigismund II, sigla, siglos, sigma, sigma baryon, sigma factor, sigma particle, sigmate, sigmatism
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for sigma
British Dictionary definitions for sigma
sigma
/ (ˈsɪɡmə) /
noun
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
Word Origin for sigma
Greek, of Semitic origin; related to Hebrew samekh
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for sigma
sigma
[ sĭg′mə ]
n.
The 18th letter of the Greek alphabet.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for sigma
sigma
[ sĭg′mə ]
A sigma baryon.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.