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We found 14 dictionaries with English definitions that include the word sigmas:
Click on the first link on a line below to go directly to a page where "sigmas" is defined.

General (10 matching dictionaries)

1. sigmas: Merriam-Webster.com [home, info]
2. sigmas: Collins English Dictionary [home, info]
3. sigmas: Vocabulary.com [home, info]
4. Sigma's, Sigmas: Wordnik [home, info]
5. sigmas: Wiktionary [home, info]
6. Sigmas: Dictionary.com [home, info]
7. Sigmas: Online Plain Text English Dictionary [home, info]
8. Sigmas: AllWords.com Multi-Lingual Dictionary [home, info]
9. sigmas: Free Dictionary [home, info]
10. sigmas: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

11. sigmas: Encyclopedia [home, info]

Medicine (1 matching dictionary)

12. sigmas: Medical dictionary [home, info]

Miscellaneous (1 matching dictionary)

13. SIGMAS: Acronym Finder [home, info]

Slang (1 matching dictionary)

14. Sigmas: Urban Dictionary [home, info]

(Note: See sigma for more definitions.)

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