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upsilon20th letter of the Greek alphabet, 1640s, from Greek u psilon, literally "a mere (or bare) 'u;' " so called in later Greek in reference to its sound. The exact reason is variously [..]
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upsilonThe twentieth letter of the Classical Greek, Classical and Modern Greek, the twenty-first letter of Old Greek, Old and Ancient Greek, Ancient.
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upsilon(n) the 20th letter of the Greek alphabet
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