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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)

1. sigma: Merriam-Webster.com [home, info]
2. Sigma, sigma: Oxford Learner's Dictionaries [home, info]
3. sigma: American Heritage Dictionary of the English Language [home, info]
4. sigma: Collins English Dictionary [home, info]
5. sigma: Vocabulary.com [home, info]
6. Sigma, sigma: Wordnik [home, info]
7. sigma: Wiktionary [home, info]
8. sigma: Webster's New World College Dictionary, 4th Ed. [home, info]
9. sigma: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. sigma: Infoplease Dictionary [home, info]
11. sigma: Dictionary.com [home, info]
12. sigma: UltraLingua English Dictionary [home, info]
13. SIGMA (verification service), SIGMA, Sigma (DJs), Sigma (Mega Man X), Sigma (album), Sigma (band), Sigma (cosmology), Sigma (couch), Sigma (disambiguation), Sigma (duo), Sigma (group), Sigma (letter), Sigma (sailplane), Sigma: Wikipedia, the Free Encyclopedia [home, info]
14. Sigma: Online Plain Text English Dictionary [home, info]
15. sigma: Webster's Revised Unabridged, 1913 Edition [home, info]
16. sigma: Rhymezone [home, info]
17. Sigma: AllWords.com Multi-Lingual Dictionary [home, info]
18. sigma: Hutchinson's Dictionary of Difficult Words [home, info]
19. sigma: Free Dictionary [home, info]
20. sigma: Hutchinson Dictionaries [home, info]
21. sigma: Mnemonic Dictionary [home, info]
22. sigma: WordNet 1.7 Vocabulary Helper [home, info]
23. sigma: LookWAYup Translating Dictionary/Thesaurus [home, info]
24. sigma: Dictionary/thesaurus [home, info]

Business (3 matching dictionaries)

25. Sigma: Glossary of Media Terms [home, info]
26. Sigma: Comprehensive Financial [home, info]
27. sigma: BusinessDictionary.com [home, info]

Computing (3 matching dictionaries)

28. SIGMA: Free On-line Dictionary of Computing [home, info]
29. SIGMA: CCI Computer [home, info]
30. Sigma (letter), sigma: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

31. SIGMA, sigma: online medical dictionary [home, info]
32. Sigma (letter), sigma: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

33. SiGMA: Acronym Finder [home, info]
34. SIGMA: AbbreviationZ [home, info]

Science (3 matching dictionaries)

35. Sigma: Eric Weisstein's World of Mathematics [home, info]
36. Sigma: Extragalactic Astronomy [home, info]
37. sigma: How Many? A Dictionary of Units of Measurement [home, info]

Slang (1 matching dictionary)

38. Sigma: Urban Dictionary [home, info]

Tech (1 matching dictionary)

39. sigma: Schlumberger Oilfield Glossary [home, info]

(Note: See sigmas for more definitions.)

Quick definitions from WordNet (sigma) ▸ noun:  the 18th letter of the Greek alphabet ▸ Also see sigmas ▸ Words similar to sigma ▸ Usage examples for sigma ▸ Idioms related to sigma (New!) ▸ Popular adjectives describing sigma ▸ Words that often appear near sigma ▸ Rhymes of sigma ▸ Invented words related to sigma