- 1. n. The Greek letter /, /, or / (English S, or s). It originally had the form of the English C. Source: opted
- 2. n. the 18th letter of the Greek alphabet Source: wordnet
- 3. The Greek letter S, or s). It originally had the form of the English C. Source: webster
- 4. The Greek letter S, or s). It originally had the form of theEnglish C. Source: adambom
- 5. n:100 n. the 18th letter of the Greek alphabet Source: ecdict
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sigma
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