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We found 39 dictionaries with English definitions that include the word SIGMA: Click on the first link on a line below to go directly to a page where "SIGMA" is defined. General (24 matching dictionaries) sigma: American Heritage Dictionary of the English Language [home, info] sigma: Collins English Dictionary [home, info] sigma: Vocabulary.com [home, info] sigma: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Sigma, sigma: Wordnik [home, info] Sigma: Wiktionary [home, info] sigma: Compact Oxford English Dictionary [home, info] sigma: Webster's New World College Dictionary, 4th Ed. [home, info] sigma: The Wordsmyth English Dictionary-Thesaurus [home, info] sigma: Infoplease Dictionary [home, info] sigma: Dictionary.com [home, info] sigma: UltraLingua English Dictionary [home, info] SIGMA (verification service), SIGMA, Sigma (Digimon), Sigma (Mega Man), Sigma (Mega Man X), Sigma (character), Sigma (couch), Sigma (disambiguation), Sigma (letter), Sigma (particle), Sigma (sailplane): Wikipedia, the Free Encyclopedia [home, info] Sigma: Online Plain Text English Dictionary [home, info] sigma: Webster's Revised Unabridged, 1913 Edition [home, info] sigma: Rhymezone [home, info] Sigma: AllWords.com Multi-Lingual Dictionary [home, info] sigma: Hutchinson's Dictionary of Difficult Words [home, info] sigma: Free Dictionary [home, info] sigma: Hutchinson Dictionaries [home, info] sigma: Mnemonic Dictionary [home, info] sigma: WordNet 1.7 Vocabulary Helper [home, info] sigma: LookWAYup Translating Dictionary/Thesaurus [home, info] sigma: Dictionary/thesaurus [home, info] Business (3 matching dictionaries) Sigma: Glossary of Media Terms [home, info] Sigma: Comprehensive Financial [home, info] sigma: BusinessDictionary.com [home, info] Computing (3 matching dictionaries) SIGMA: Free On-line Dictionary of Computing [home, info] SIGMA: CCI Computer [home, info] Sigma (letter), sigma: Encyclopedia [home, info] Medicine (2 matching dictionaries) SIGMA, sigma: online medical dictionary [home, info] Sigma (letter), sigma: Medical dictionary [home, info] Miscellaneous (2 matching dictionaries) SiGMA: Acronym Finder [home, info] SIGMA: AbbreviationZ [home, info] Science (3 matching dictionaries) Sigma: Eric Weisstein's World of Mathematics [home, info] Sigma: Extragalactic Astronomy [home, info] sigma: How Many? A Dictionary of Units of Measurement [home, info] Slang (1 matching dictionary) Sigma: Urban Dictionary [home, info] Tech (1 matching dictionary) sigma: Schlumberger Oilfield Glossary [home, info]

Quick definitions from WordNet (sigma) ▸ noun:  the 18th letter of the Greek alphabet